题目内容
You_______ buy a gift, but you can if you want to.
A. must B. mustn't
C. have to D. don't have to
【解析】D
试题分析:句意:你不必买礼物,但是如果你想买的话你可以买。A. must必须;B. mustn't禁止,不许可; C. have to必须; D. don't have to不必。结合句意,故选D
考点:考查情态动词的用法
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