题目内容
9.Mary ______ her homework when her mother got home yesterday.( )| A. | does | B. | did | C. | is doing | D. | was doing |
分析 昨天当Mary的妈妈到家的时候,她正在做作业.
解答 答案:D
根据yesterday昨天,可知用过去时,排除A C,当妈妈回来的时候Mary正在做作业,选择过去进行时,故选D.
点评 本题考查学生when引导的时间状语从句,从句动作用一般过去时,主句用过去进行时.表示一个动作发生时,另一个动作正在进行.
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