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    精英家教网 > 高中英语 > 题目详情
    You       buy a gift, but you can if you want to.
    A．mustB．mustn'tC．have toD．don't have to
    D

    试题分析：don’t have to 没有必要做某事儿，mustn’t 则为禁止。句意：你没有必要买礼物，但是如果你想的话，你可以买。must 必须, mustn’t表禁止 have to 不得不。
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