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    — May I smoke here?
    — No, you ________. Can’t you read the sign “NO SMOKING”?

    A．mustn’t B．won’t C．needn’t D．Don’t have to

    A

    解析试题分析：mustn’t表示“禁止”。won’t表示“不愿”。needn’t, not have to都表示“不必”。故答案为A。
    考点：情态动词。

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