Mary her homework when Jean knocked at the door． [ ] A．was doing B．did C．had done D．has done 题目和参考答案——青夏教育精英家教网—

题目内容

Mary ________ her homework when Jean knocked at the door．

[　　]

A．was doing

B．did

C．had done

D．has done

答案：A
解析：

选A。when引导的时间状语从句，连接两个动作，其中持续较长的动作用过去进行时，较短的动作用一般过去时，表示在一个动作发生的过程中，另一个动作发生了。

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