---Must we leave the classroom now?
---No, you _____. You _____ leave after the bell rings.

A．mustn't; are allowed toB．don't have to; might
C．needn't; canD．can't; are supposed to

C

解析試題分析：must的含義是必須一定，其否定形式mustn’t表示禁止的含義。故must的否定回答一般借助于needn’和don’t have to來構(gòu)成，句意:我們現(xiàn)在必須離開教室嗎？——不，你們不必。你們可以在鈴響之后離開教室。在表示可能時，might表示推測語氣，can表示客觀的能力，結(jié)合語境可知選C。
考點：must的用法
點評：must的否定形式是�？純�(nèi)容之一，結(jié)構(gòu)比較固定，熟記即可。

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