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I was doing homework ________ he came in.


  1. A.
    when
  2. B.
    while
  3. C.
    as
  4. D.
    before
A
考查同义词辨析。when引导时间状语从句,单纯表示时间,从句中谓语动词可以是表示延续性动作的也可以是表示短暂性动作的;while引导时间状语从句强调主句中谓语动词贯穿于从句所指的整个时间段,且从句中的动词要用延续性动词。如:I kept silent while he was writing.他写的时候,我默不作声。as引导时间状语从句,强调主句与从句动作同时发生。
如:She sang as she went along.她边走边唱。before表示“在……之前”。由以上可知A项正确。
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