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—May I swim here?  
— No, you _______.  It is dangerous.
A.won’tB.needn’tC.mustn’tD.don’t have to
B

试题分析:考查情态动词:句意:--我可以游泳吗?--不,你不可以。太危险。Won’t“不愿”,needn’t“不必”,mustn’t禁止,don’t have to不必,选B。
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