答案是 B.were;doing
when your mother came back 当你的妈妈回来,这是过去完成时态,因此前面的动作是过去正在进行时态
what you when your mother came back?
what you when your mother came back?
A.are;doing B.were;doing C.did;do D.was;doing
A.are;doing B.were;doing C.did;do D.was;doing
英语人气：596 ℃时间：2019-12-08 05:37:10
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