◎ 题干
You have to stay behind if your homework         before five o'clock.
A.wasn’t done B.hasn’t done
C.doesn't do D.isn't done
◎ 答案
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“You have to stay behind if your homeworkbefore five o'clock.A.wasn’t doneB.hasn’t doneC.doesn't doD.isn't done…”主要考查了你对  【被动语态】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。