.— John,you _____ go out to play until your homework __________ .—OK,Mum.
.Amust; finishes B.can’t; is finished C.can’t; has finished D.needn’t; finishes
人气：143 ℃ 时间：2019-10-28 05:02:11
解答
选 B can’t; is finished homework,是被做完的,所以一定要用被动语态.这里只有 B 里的 is finished 是被动语态.C has finished 是现在完成时,不行.如果要用现在完成时,要说：until your homework has been finished...
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