题目内容
【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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题目内容
【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。