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You       buy a gift, but you can if you want to.
A．mustB．mustn'tC．have toD．don't have to
D

試題分析：don’t have to 沒有必要做某事兒，mustn’t 則為禁止。句意：你沒有必要買禮物，但是如果你想的話，你可以買。must 必須, mustn’t表禁止 have to 不得不。
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