Her mother came back while she ( )her homework A did B doing C wa_英语解答

Her mother came back while she ( )her homework A did B doing C was doing D does

人气：342 ℃　时间：2019-08-20 15:53:43

解答

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.