常用的连词有：when，whenever(无论什么时候)，since，as，until，hardly…when，no sooner…than，as soon as，before，after，the moment，the minute(一…就…)
1、No sooner had they got the goods covered up _____ it started raining hard.
A. when B. than C. then D. after
(答案：B。no sooner…than 引导的时间状语从句。)
2、She has wanted to become a nurse _____ since she was a young girl.
A. long B. often C. always D. ever
常用if，unless(除非，如果不)，as/so long as只要。
1、_____ I’m mistaken, I’ve seen that man before.
A. Unless B. If C. Because D. Provided
2、_____ you return those books to the library immediately you will have to pay a fine.
A. Until B. Unless C. If D. Provided (答案：B)
常用：because, as, since。如果表示必然的因果关系，一般用because引入;而since表示一种间接或附带的原因;用as 只是提一下。
1、He cannot go to school because he is ill. 他因为生病不能上学。
2、Everyone likes you as you are both kind and honest. 人人都喜欢你，因为你既和气，又诚实。
常用though/although，as (尽管)，even if/though，however，whatever，wherever，whoever，no matter how/what/who等。
1、In short, _____ he lives, a man belongs to some society.
A. whatever B. whenever C. whichever D. wherever
(答案：D。wherever引导让步状语从句，wherever = no matter where)
2、_____, you must show your ticket to go into the cinema.
A. No matter whoever you are B. Whomever you are C. Whoever you are D. No matter who are you
(答案：C。whoever,引导让步状语从句，= no matter who)
3、_____ you disagree with her, her idea is still worth considering.
A. Even if B. If only C. Instead of D. Despite of (答案：A。让步状语从句。)
4、Young _____ he is, he knows what is the right thing to do.
A. that B. as C. although D. however
常用as, just as, as if/though 等词。
1、_____ was pointed above, this substance can be used as a substitute.
A. It B. That C. What D. As (答案：D。As引导方式状语从句。)
2、He talks as if he _____ everything in the world.
A. knows B. knew C. had known D. would have known
常用so that , in order that, lest (以免， 以防), in case。
1、I wrote it down _____ I should forget it.
A. in case B. in case of C. in order that D. for fear of (答案：A)
2、I’ll give you my phone number, so that you can call me when you arrive here.
They are _____ students that they all performed well in the nationwide examinations.
A. so diligent B. such diligent C. so much diligent D. such very diligent (答案：B)
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