◎ 题干
The windows must _____ before you leave the room.
[     ]
A. be closed
B. are closed
C. close
D. be close
◎ 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“The windows must _____ before you leave the room. [ ]A. be closed B. are closedC. close D. be close…”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。