when (当……时候) where (在哪儿)
while (当……时候；相反) because (因为) 答案 C
10. ________ it is very late now， the students are still working in the lab。 A. As B. When C. If D. Although as 因为
when 当……时候 if 如果 although 尽管 答案 D 考试重点
连词分为从属连词和并列连词，从属连词用来连接各类从句，并列连词用来表示并列句之间转折、因果、并列、选择、递进等关系。考生应了解常见连词的意思，根据句子上下文的需要进行恰当的选择。
1.The boy wanted to play football. _____， it was raining and he stayed at home。 A. And B. But C. So D. For
and(并且)； but (但是)；so (所以)；for (因为) 答案 B
2.The couple have lived in China for five years， so they have got used to the life here。
3.I wonder if you have met my sister。(if 是否)
4.The research results show that the earth goes a little faster _______ it is closer to the sun。
A. as if B. so that C. than D. when
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as if (仿佛)；so that (以便，为了)；so……that(如此……以至于)； than (连接比较级)；when (当……时候) 答案 D
5.________ I havent seen the film， I know very little about it。 A. After B. Although C. As D. Before
after (在什么之后)；although (尽管)；as (因为)；before (在……之前) because和so不能同时用 as和so不能连用 答案 C
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