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---What were you doing__________ it was ...

---What were you doing__________ it was raining?    ---I was reading a book.

A. before    B. if    C. while    D. after

 

C 【解析】句意:当下雨时你正在干什么?-----我正在读书。考查连词用法。A. before在…以前,以前; B. if 如果; C.当…时候,引导时间状语从句,while后面的从句进行时态; D. after在…以后。结合句意和语境可知选D。 点睛:when,while都有“当……时候”的意思。when和while的区别还在于:while引导的时间状语从句多用进行时态,而when引导的时间状语从句多用一般时态。when既可表示某一点时间,也可以表示某一段时间 。while只能表示某一段时间,不能表示某一点时间。在while引导的时间状语从句中,其谓语动词只能是延续性的,而且也只能与主句中的谓语动词同时发生或存在。  
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