◎ 题干
—Must they clean and tidy the classroom now?
—No, they            . It             after school in the afternoon.

[     ]

A. mustn't; must clean
B. needn't; must clean
C. mustn't; need be cleaned
D. don't have to; can be cleaned
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◎ 解析
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◎ 知识点
    根据魔方格专家分析,试题“— Must they clean and tidy the classroom now?— No, they. Itafter school in the afternoon. [ ]A. mustn't; must clean B. needn't; must clean C. mustn't;…”主要考查了你对  【情态动词】【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。