Her mother came back while she ( )her homework A did B doing C was doing D does
Her mother came back while she ( )her homework A did B doing C was doing D does
英语人气：547 ℃时间：2019-08-20 15:53:43
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选C吧.While是 当……的时候,后面应该接进行时,本句话的意思是她妈妈回来的时候她正在做家庭作业.
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