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---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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