题目内容

---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

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:我们现在必须离开教室吗？——不，你们不必。你们可以在铃响之后离开教室。在表示可能时，might表示推测语气，can表示客观的能力，结合语境可知选C。
点评：must的否定形式是常考内容之一，结构比较固定，熟记即可。
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