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15.When Jim's mother came in,he _______ his homework.(  )
A.is doingB.has doneC.was doing

分析 当Jim的妈妈进来时,他正在做他的作业.

解答 答案:C 根据时间状语when Jim's mother came in,可知做作业这一动作发生在过去的一个时间点,故应该用过去进行时(was/were+doing),A为现在进行时;B为现在完成时.故选C.

点评 本题考查过去进行时.根据when引导的时间状语从句是做题的关键.

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