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【题目】 When Jim’s mother came in , he his homework.

A. is doing B.has done

C.was doing D.had done

【答案】C

【解析】

试题分析:句意:当吉姆的妈妈进来时,他正在做作业。过去进行时可以表示在过去某个时间点正在发生的事情。时间点可以用介词短语、副词或从句来表示。结合句意,故选C。

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