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语法：连词 Link words
连词是虚词，不能在句中单独担任成分，只起连接作用。按其用法，连词可分为两大类：并列连词(Coordinate Conjunctions)和从属连词(Subordinate Conjunctions)。
一．并列连词：连接具有并列关系的词、短语或句子。
1. 并列关系：and, not only…but also…, both…and…, neither…nor…
I used to live in Paris and London.
Both Jane and Jim are interested in fishing.
The weather here is neither too cold nor too hot.
She is not only kind but also honest.
2. 转折关系：but, yet, while(然而), when(然而，偏偏)
The car is very old but it runs very fast.
The problem was a little hard, yet I was able to work it out.
The winter in Beijing is very cold while that of Kunming is warm.
Why did you borrow the book when you had one?
3. 选择关系：or, not…but…, either…or…,
Would you like to live or would you like to stay?
He is not a teacher but a writer.
You can come either on Saturday or on Sunday.
4. 因果关系：for
It must have rained last night, for the ground is wet now.
The leaves of the trees are falling, for it’s already autumn.
5. 区别
（1）and和or
1) 并列结构中，or通常用于否定句，and用于肯定句。
2) 但有时and 也可用于否定句。请注意其不同特点：
There is no air or water in the moon.
There is no air and no water on the moon.
在否定中并列结构用or 连接，但含有两个否定词的句子实际被看作是肯定结构，因此要用and。
典型例题
---I don’t like chicken ___ fish. ---I don’t like chicken, ___ I like fish very much.
A. and； and B. and； but C. or； but D. or；and
答案C。否定句中表并列用or, but 表转折。
判断改错：
(错) We will die without air and water.
(错) We can’t live without air or water.
(对) We will die without air or water.
(对) We can’t live without air and water.
(2) 表示选择的并列结构
1) or 意思为"否则"。
I must work hard, or I’ll fail in the exam.
2) either…or 意思为"或者……或者……"。注意谓语动词采用就近原则。
Either you or I am right.
(3) 表示转折或对比
1) but表示转折，while表示对比。
Some people love cats, while others hate them.
典型例题
--- Would you like to come to dinner tonight? --- I’d like to, ___ I’m too busy.
A. and B. so C. as D. but
答案D。but与前面形成转折，符合语意。而表并列的and， 结果的so，原因的as都不符合句意。
2) not…but… 意思为"不是……而是……" not 和but 后面的用词要遵循一致原则。
They were not the bones of an animal, but (the bones) of a human being.
(4) 表原因关系
1) for
判断改错：
(错) For he is ill, he is absent today.
(对) He is absent today, for he is ill.
for是并列连词，不能置于含两个并列分句的句子的句首，只能将其放在两个分句中间。
2) so, therefore
He hurt his leg, so he couldn’t play in the game.
注意：
a. 两个并列连词不能连用，但therefore, then, yet.可以和并列连词连用。
You can watch TV, and /or you can go to bed.
He hurt his leg, and so / and therefore he couldn’t play in the game.
b. although… yet…，但although不与 but连用。
(错) Although he was weak, but he tried his best to do the work..
(对) Although he was weak, yet he tried his best to do the work.
(5) 注意：
not only… but also 关联两个分句时，一个分句因有否定词not 而必须倒装。
Not only does he like reading stories, but also he can even write some.
neither…nor 意思为"既不……也不……"谓语动词采用就近原则，与nor后的词保持一致。
(6) 比较so和 such
其规律由so与such的不同词性决定。such 是形容词，修饰名词或名词词组，so是副词，只能修饰形容词或副词。so 还可与表示数量的形容词many，few，much， little连用，形成固定搭配。
so + adj. such + a(n) + n.
so + adj. + a(n) + n. such + n. (pl.)
so + adj. + n. (pl.) such +n. (pl.)
so + adj. + n. [不可数] such +n. [不可数]
so foolish such a fool
so nice a flower such a nice flower
so many/ few flowers such nice flowers
so much/little money. such rapid progress
so many people such a lot of people
so many 已成固定搭配，a lot of 虽相当于 many，但 a lot of 为名词性的，只能用such搭配。
so…that与such…that之间的转换即为 so与such之间的转换。
二．从属连词：指在复合句中引导从句的连结词。常见的从属连词有：
引导时间状语从句的：after, before, when, as, while, since, until, till, as soon as
引导原因状语从句的：because, since, as
引导让步状语从句的：although, though, no matter（无论）, even if (though)
引导条件状语从句的：if, unless, once, as (so) long as
引导结果状语从句的：so, so that, so … that …, such … that …
引导目的状语从句的：so, so that …, in order that …
引导比较状语从句的：as … as …, not so (as), as, than
引导方式状语从句的：as, as if …, as though
引导地点状语从句的：where，wherever
引导名词性从句（主语，宾语、表语或同位语从句）的连词主要有：that, whether, if三个。其中that 和whether间或还可以引起同位从句和状语从句。
（一）某些用法比较特殊的从属连词用法区别
1、当while, when, as引导时间状语从句时的区别：
①while引导的状语从句中动词必须是延续性。谓语动词多为进行时，或状态动词的一般时。while 的这些用法可用when代替，等于 “at the time that”, “during the time that”。
例如：Please keep quiet while (when) others are studying；
② when除可指一段时间外，还可用来指一点时间，等于 “at the time”， when引出的时间状语从句中的谓语动词可以是终止性的，也可以是延续性的。因此主句和从句的谓语可以是一般时，进行时，或完成时。
例如：When I went into the lab, the teacher was doing an experiment.（不能用while）
He often makes mistakes when he is speaking English.（when可换成while）
③as常可与when，while通用，但强调“一边、一边”。
例如：As (when, while) I was walking down the street, I noticed a police car in front of number 37.
④when引导的状语从句中的主语与主句主语一致，主、谓是“主语+系动词”结构时，这时主语和系动词可以省略。
例如：When (he was) young, he worked for a rich man.
She’ll be here to give you help when (if it is) necessary.
⑤when有时代替if，引导条件句，意为“如果”、“假如”，例如：I’ll come when (if) I’m free.
2、before作连词一般表示时间，意为“在…之前”，但有些句子中这样译就显得别扭。试看以下句子的翻译：He almost knocked me down before he saw me.他几乎把我撞倒才看见我；
Before I could get in a word he had measured me.我还没来得及插话，他已经给我量好了尺寸。
3、till, until作为介词式从属连词引导时间状语短语或状语从句，用于否定句时，结构为not …until (till)，主句谓语动词延续与非延续皆可，意为“直到…才…”。用于肯定句时，只与延续性动词连用，表示“到…为止”。
例如：They played volleyball until (till) it got dark.
They didn’t talk（延续）until (till) the interpreter（译员）came.
He didn’t go to bed（非延续）until (till) the his father came back.；until可以放在句首，till则不行，
例如：Until the last minute of the match we kept on playing.
Not until he finished his work did he go home.（倒装）；till, until只用于时间，
以下句子是错误的：We walked till the edge of the forest.（要用as far as或to）。
4、because, since, as引导原因状语时注意使用上的区别：
①如果原因构成句子的最主要部分,一般用because ,因此because引导的从句往往放在句末。用why提问的句子，一定用because回答。
例如：He had to stay at home yesterday because he was ill.；
②如原因已为人们所知，或不如句子的其他部分重要，就用as，或 since。since比as更正式些。as和since引导的从句一般放在句子的开头。
例如：As you are tired, you had better rest./ Since everyone is here, now let’s begin.
5、although和though引导让步状语从句往往用法一样，但注意以下区别：
①although用于各种文体，而though则多用于非正式的口语或书面语中。注意由although, though引导的从句后，主句不能用but，但可用副词yet, still。
例如：Although/ Though it rained all the morning, they still went on working.（或yet they went on working）
②though常与even连用，even though表示强调，意为“即使”，但不能说even although，
例如：Even though I didn’t understand a word, I dept smiling.
③though可用作副词，意为“然而”，常用逗号与句子分开。although则不能这样使用，它只作连词。
例如：It was a quiet party, I had a good time, though.
6、once作副词译“曾经”，作为连词译“一旦”，引导条件状语从句。相当于if的加强形式。
例如：I don’t believe he was once a thief. (once这里是副词)/
Once Aristotle had made up his mind that heavy objects always fell faster than light objects, he taught it as a truth to his students. (once连词)
7、unless引导条件状语从句等于if … not …。
例如：He’ll accept the job unless the salary is too low. ( = He’ll accept the job if the salary is not too low.)
8、在用as if引导的方式状语从句及表语从句中，根据情况要使用虚拟语气。
例如：He talks as if he knew all about it. 但有时也可用直陈语气。
It looks as if it is going to rain.
9、whether, if引导从句的用法区别：
①引导主语从句、表语从句或同位语从句时，用whether，不用if。
例如：Whether they will go to the Great Wall is not known./
The question is whether we can finish the task on time./
The question whether we will take part in the physics contest has not been decided.
②whether可接不定式，而if则不可。例如：I haven’t decided whether to leave or not.
③whether可作介词的宾语或置于句首表示强调，而if则不可。
例如：Everything depends on whether we have enough money./
Whether he will come, I am not sure.
④whether和if均可引导宾语从句， whether引导的宾语从句一般都是肯定句，if引导的宾语从句可以是肯定的，也可以是否定的（此时不能用whether），
例如：Could you tell us whether/ if it rains in winter in Australia?/
I wonder if it doesn’t rain.
⑤引导宾语从句的whether和if常可与or not连用。连用时要注意or not的位置，它一般与 whether、if分开使用，有时它可与whether合起来使用，但不能与if合起来使用。
例如：I don’t know whether/ if they will come or not./
I don’t know whether or not they will come.
⑥if可用来引导条件状语从句，译“如果”，whether则不行。
例如：If you work hard, you are sure to succeed.
10、as作从属连词可引导多种状语从句。
①as引导时间状语从句，意为“当…时”。
例如：As (he was) a young man, he was a storekeeper and later a postmaster./ He sang as he worked.
②as引导方式状语从句，意为“象…一样”。例如：We must do as the Party teaches us.
③as引导原因状语从句。意为“由于”，例如：As you are tired, you had better rest.
④as引导让步状语从句。意为“虽然”、“尽管”Child as he is, he can do it well. ( = Although he is a child, he can do it well.) 另外，as做为关系代词还可以引导定语从句，如：I have the same book as you.
连词while是高考一个命题的热点，你知道其考点主要涉及哪些方面吗？
一、考查表示时间的用法，其意为“当……的时候”。如：
We must strike while the iron is hot. 我们要趁热打铁。
Stand still while I take your photograph. 我给你拍照时站着不要动。
Have we got enough books to read while we are on holiday? 假期里我们有足够的书看吗?
Were there any calls for me while I was out? 我出去的时候，有人来过电话吗?
She hates anyone listening while she is telephoning. 她打电话时不愿让任何人听。
二、考查表示让步的用法，其意为“尽管”“虽然”。如：
While the work was difficult, it was interesting. 虽然工作有难度，但很有趣。
While I understand what you say, I can’t agree with you. 虽然我理解你的意思，但我还是不同意。
三、考查表示对比的用法，其意为“而”“但”。如：
Some people waste food while others haven’t enough. 一些人糟踏食物而另一些人却食不果腹。
I went swimming while the others played tennis. 我去游泳，而其余的人则去打网球了。
Prices are rising sharply, while incomes are lagging far behind. 物价飞涨而收入却远远落后。
注：这样用时，while引出的句子通常位于末，但有时也可位于句首。如：
While most children learn to read easily, some need extra help. 大多数儿童学会阅读很容易，有一些儿童却需要特别帮助。
While Deauville is a holiday resort, Trouville is more of a working town. 特维尔是个度假胜地，而特鲁维尔更多的却是个工业城市。
四、考查其省略用法，即主句与从句主语相同，且从句谓语动词含有动词be时，通常可省略从句主语和动词be。如：
While (he was) in prison, she wrote her first novel. 她在狱中写出了第一部小说。
He had strayed from home while still a boy. 他小时候就离开家到处流浪了。
He fell asleep while (he was) doing his homework. 他做着做着功课就睡着了。
I was only listening to the radio with half an ear, while (I was) preparing some food. 我正在做吃的东西，没太留心听收音机。
【考点实训】
1. She just sits there reading her story book, _________ I do all the work.
A. until B. while C. because D. though
2. Their economy has expanded enormously, _________ ours, by contrast, has declined.
A. while B. unless C. in case D. which
3. Could you watch my bags for me, _________ I go to the toilet?
A. though B. unless C. what D. while
4. The professor is typing his own letters _________ his secretary is ill.
A. what B. which C. if D. while
5. She said she was going to the shops and asked me whether I wanted anything _________ she was out.
A. though B. while C. which D. before
6. Tea is the most popular drink, _________coffee comes second.
A. since B. until C. what D. while
7. Schools in the north tend to be better equipped, _______ those in the south are relatively poor.
A. since B. before C. while D. because
8. It is no accident that men fill most of the top jobs in nursing, _______ women remain on the lower grades.
A. after B. since C. while D. which
9. _________ trying to open the can, I cut my hand.
A. Though B. Because C. For D. While
10. Some people prefer a vegetarian diet, _________ others prefer a meat-based diet.
A. though B. while C. which D. for
11. He didn’t ask me in; he kept me standing at the door _________ he read the message.
A. while B. before C. after D. which
12. Now’s the time to buy a car, _________ the interest rates are low.
A. but B. which C. while D. until
13. The couple took good care of the baby _________ occupied by their work.
A. while B. after C. which D. since
14. How did you spend your time _________ you were on holiday?
A. although B. while C. which D. since
15. Because Jane had once had a bad accident _________ driving, she was afraid to try it again.
A. though B. unless C. for D. while
（以上答案均是while）
改错题
1.连词
(1) I'm sorry, and I won't be able to come tonight.
(2) He is not only a football player and also a famous writer.
(3) What he said at the meeting was either important nor true.
(4) You must get up early tomorrow, for I will go there alone.
(5) Without both money or talent, science would progress slowly.
(6) Though we got very tired, but we didn't stop working in the factory.
(7) Where Peter goes, he is welcome.
(8) You'll miss the train until you hurry up.
(9) If you are there or not doesn't matter much.
(10)The book is interesting so it has many stories of adventure.
(ll)You won't know the value of health after you lose it.
(12)Our flight from Beijing to London was delayed because the heavy fog.
(13)Read the text slowly so you may understand the story better.
(14)Do you know how Jane is getting on well with her classmates?
(15)For you are free tonight, why not drop in and play chess with me?
(16)It was already ten o'clock that we got to the park yesterday morning.
(17)We know nothing about the man besides that he is from London.
(18) Teachers should have patience, so children would never learn anything.
(19)My brother is in favour of playing football, when my sister insisted on swimming.
(20)The reason why Michael has made such great progress is because he has never wasted his time.
2.强调句
(1) Where was it she found her lost necklace?
(2) It is the people who is really powerful.
(3) It were Tim and Jim who cleaned the room.
(4) There is not everybody that can draw so well.
(5) Bob hoped it would be him who would be invited.
(6) It is at the gate where she will be waiting for me.
(7) It was the first newspaper which was printed on a moving train.
(8) It was because the bus broke down on the way to the station we missed the train.
(9) Is it Tom that you saw yesterday?
(10) It was noon that we got to the small village.
1.连词
(1) 答案：and改为but，I'm sorry，but．．是一个固定说法。
(2) 答案：and改为but; not only．．．but also．．．，固定搭配。
(3)答案：either改为neither，neither．．．nor．．．，“既不……也不……”。
(4)答案：for改为or, 否则，符合句意。
(5)答案：or改为and，both．．．and．．．固定搭配。
(6)答案：去掉but，though不能跟but连用。
(7)答案：Where改为Wherever，Wherever引导让步状语从句，“无论彼得到哪里”。
(8)答案：until改为unless，unless＝if hot除非，如果不，符合句意。
(9)答案：If改为Whether．在句首引导名词性从句，用whether不用if.
(10)答案：so改为because，because引导原因状语从句，符合句意。
(ll)答案：after改为until，not．．．until，直到……才。
(12)答案：because后加of. because of后加名词、代词作宾语。
(13)答案：so后加that， so that引导目的状语从句。
(14)答案：how改为that that引导一个宾语从句，或去掉well，由how引导宾语从句。
(15)答案：For改为Since．for引导的并列分句不能放在句首。
(16)答案：that改为when．这不是一个强调名型，it指时间；when引导一个时间状语从句。
(17)答案：besides改为except．besides，除……之外还有；except，除……之外。
(18)答案：so改为or／otherwise．or／otherwise，否则。
(19)答案：when改为while．while而，然而。
(20)答案：because改为that．The reason is that．．．，that引导表语从句，解释、说明reason的内容。
2.强调句
(1)答案：it 后加that强调句式的特殊疑问句，疑问词+is／was it +that+句子其他部分。
(2)答案：who is 改为who are．本句强调的是主语the people，谓语用复数
(3)答案：were改为was．强调句式为It is／was+被强调部分，不管被强调部分在句中是什么成分，也不管被强调部分的单复数，句式一律是it was／is+被强调部分。
(4)答案：There改为It本句为强调句，其结构为his／was+被强调部分+that+句子其他部分。
(5)答案：him改为he强调句式强调的是主语，用主格。
(6)答案：where改为that．强调句式中只能用that引导句子的其他部分；如果强调的是主语，指人，可以用who引导句子其 他部分。
(7)答案：which改为that同上。
(8) station后+that
(9) Is - Was
(10) at noon
练习 连词
1 .He is very old,____ he still works very hard.
A. but B.if C.when D.as
2. ____ you are dismissed.
A. Neither you go nor B. Either you go or C. Whether you go or D. Both you go and
3. They had camped once before, ____ they knew what to take.
A. because B. now C. so D. since
4. Why these things happened was ____ the driver had been careless.
A. because of B. owing to C. due to D. that
5. Although, it's raining, ____are still working in the fields.
A. they B. but they C. and they D. so they
6.___we have satisfied you, you have no grounds of complaint.
A. So B. Since that C. Now that D. By now.
7. Write clearly ____ your teacher can understand .you correctly.
A. since B. for C. because D. so that
8.You'll miss the train ____ you hurry up.
A. unless B. as C. if D. until
9. Francis did the task____ his brother.
A. as good as B. as better as C. as well as D. as best as
10.The size of the audience,____ we had expected, was well over twenty thousand.
A. as B. what C. that D. whom
11.I thought he hated the TV .You are right,____ he still watches the program.
A. yet B. besides C. also D. then
12. It looks ____ it's going to rain.
A. that B. as C. as if D. like that
13.____ to New York, her father has not heard from her.
A. Because she went B. After she went C. When she went D. Since she went
14.___he daydreamed, Peter saw figures in the sky.
A. Until B. Since C. While D. During
15. We arrived at the station ____ the train had left.
A. after B. before C. since D. when
16.____ he was in poor health, he worked just as hard as everyone else.
A. But B. Although C. Even if D. If
17. Give me one more minute ____ I'll have finished.
A. so B. until C. and D. when
18. The worker hunted for jobs in New York for months,____ he could not find any work.
A. and B. yet C. or D. and but
19. Hurry up, ____ you'll be late.
A. or B. and C. so D. yet
20. Do not make the same mistake ____ I did.
A. so B. as C. like D. that
21. My sister is expecting me,____ I must be off now.
A. however B. or C. so D. otherwise
22. We should pay attention ____ to industry ____ to agriculture.
A. either, or B. neither, nor C. not, but D. both, and
23. He ran off____ I could stop him.
A. before B. after C. since D. when
24.____ you told me, I had heard nothing of what happened.
A. Till B. Until C. After D. Since
25. Where have you been ____ you left home?
A. before B. as C. since D. when
26.____ the problem of method is solved, talking about the task is useless.
A. Until B. Since C. After D. Unless
27. We have produced 15% more cotton this year____ we did last year.
A. as B. than C. like D. white
28.It is late; ____, I'm too tired to go out.
A. besides B. except C. except for D. except that
29. Everything around us is ____ solid ..liquid ____ gas.
A. not .. .but... B. either.. .or... C. neither.. .nor... D. whether.. .or...
30. He will come ____ you ask him.
A. whether B. unless C. if D. while
31.____ he will come or not is still unknown.
A. If B. Where C. That D. Whether
32.I don' t know ____ to stay at home or go out.
A. whether B. if C. how D. where
33. He spoke loudly ____ the audience could hear him clearly.
A. so B. that C. so that D. in order to
34. The book is not easy.____ it's rather difficult.
A. On the one hand B. On the contrary C. On the other hand D. On the other contrary
35. You must work hard,____ you will not learn English well.
A. if B. whether C. otherwise D. unless
36. It rained heavily,____ the basketball match had to be put off.
A. so that B. when C. otherwise D. therefore
37. We must do ____ the people want us to do..
A. whatever B. however C. wherever D. whenever
38. You are certainly right,____ others may say.
A. what B. whatever C. that D. as
39.____ makes mistakes must correct them.
A. Who B. What C. Whoever D. Whatever
40.I’ll discuss it with you ____ you like to come.
A. when B. where C. whoever D. whenever
41.____ you work, you must always serve the people heart and soul.
A. Wherever B. Whenever C. Where D. When
42.___you understand this rule, you will have no further difficulty.
A. Once B. At once C. Only D. Only then
43.___ difficult the task may be, we must fulfil it this month.
A. No matter how B. No matter what C. No matter when D. No matter where
44. We can surely overcome these difficulties _,___ we are closely united.
A. so far as B. so long as C. as soon as D. as well as
45.___ I know he will stay here for half a year.
A. as soon as B. as long as C. so far as D. as well as
46. Please write me ____ you arrive in New York.
A. as well as B. so long as C. as far as D. as soon as
47. That is not ____ I want.
A. that B. why C. what D. whose
48. ___ he did it remains a secret.
A. What B. Whom C. Which D. How
49. It is quite clear ____ he won't see us.
A. what B. that C. why D. how
50. Would you tell me ____ way I should take?
A. what B. that C. which D. whose
51. I am sure ____ you said is true.
A. what B. that C. which D. who
52. The trouble is ____ we can not find such an expert.
A. why B. that C. where D. /
53. It has not been decided ____ they will leave.
A. why B. when C. which D. what
54. We shall go ____ you are ready.
A. while B. as soon as C. as D. since
55. He will tell you about it ____ you get there.
A. while B. as C. when D. /
56. Don't try to get off the bus ____ it has stopped.
A. while B. as C. since D. before
57. I'll come and see you _____ I go to the countryside.
A. while B. when . C. as soon as D. before
58. ___ he came to study in the university, he has made much progress in the study of English.
A. While B. When C. Since D. After
59. Things have changed a lot ____ I wrote to you last time.
A. when B. since C. as D. before
60. I can't use your pen, ___ there is no ink in it.
A. for B. when C. if D. whether
61. I'd like to go swimming ____ the water is not too cold.
A. for B. unless C. if D. whether
62. Difficulties are nothing ___ we are not afraid of them.
A. for B. as C. if D. whether
63. The doctor will not perform the operation ___ it is absolutely necessary.
A. when B. if C. for D. unless
64. Go back ___ you came from. A. until B. where C. which D. when
65. He lay ___ the grass was the thickest. A. where B. when C. that D. after
66. You will find friendly people ___ you go in China.
A. where B. and C. wherever D. so
67. ___ it was already dark, they went on working in the fields.
A. If B. Whether C. But D. Though
68. ___ he has finished writing the novel is unknown.
A. If B. Whether C. When D. While
69. We'll go and see the patient ___we are busy.
A. even if B. for C. if D. while
70. The museum is ___ far ____ it will take us half an hour to get there by bus.
A. such... that B. as...as C. so...that D. so … as
练习、连词
1．(全国卷2)13. We thought there were 35 students in the dining hall, ______, in fact, there were 40.
A. while B. whether C. what D. which
2．(北京卷)34. He found it increasingly difficult to read, _______ his eyesight was beginning to fail.
A. and B. for C. but D. or
3．(辽宁卷)24.He was about halfway through his meal _______ a familiar voice came to his ears.
A. why B. where C. when D. while
4．(辽宁卷)34.I grew up in Africa, at least I should say that I spent much of the first ten years of my life there.
A. and B. or C. so D. but
5．(四川卷)24. Start out right away, ________ you'll miss the first train.
A. and B. but C. or D. while
6．(天津卷)2. The cost of living in Glasgow is among the lowest in Britain, the quality of life is probably one of the highest.
A. since B. when C. as D. while
7．(湖南卷)23.A man cannot smile like a child, ___ a child smiles with is eyes, while a man smiles with his lips alone.
A. so B. but C. and D. for
练习 连 词：答案
1~5 ABCDA 6~10 CDACA 11~15 ACDCA 16~20 BCBAB 21~25 CDABC
26~30 BBABC 31~35 DACBC 36~40 AABCD 41~45 AAABC 46~50 DCDBC
51~55 ABBBC 56~60 DDCBA 61~65 CCDBA 66~70 CDBAC
1-7 ABCBC DD
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