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You       buy a gift, but you can if you want to.

A.must B.mustn't C.have to D.don't have to

D

解析试题分析: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。
考点:考查情态动词

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