Her mother came back while she ( )her homework A did B doing C was doing D does
问题描述:
Her mother came back while she ( )her homework A did B doing C was doing D does
答
C
答
C。使用过去进行时。“当她妈妈回来时,她正在写作业。”
答
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.
答
c