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【题目】 Mary ______ her homework when her mother got home yesterday.

A. does B. did C. is doing D. was doing

【答案】D

【解析】

试题分析:句意:玛丽当她妈妈昨天到家时正在做作业。根据时间状语从句,可知用过去进行时,故选D。

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