题目内容

-----Must we clean the classroom now?------No ,you _______.
A． mustB． needn’tC． aren’tD． mustn’t
B

试题分析：must的含义是必须一定，其否定形式mustn’t表示禁止的含义。故must的否定回答一般借助于needn’和don’t have to来构成。句意：我现在必须打扫教室吗？——不，你不必。结合语境可知选B。
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