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:句意为,你不必买礼物了,但是如果你愿意的话也可以买。根据句意可知此处须用否定形式,故排除A、C项;mustn’t 表示禁止;don’t have to 意为“不必……”,故选D。
点评:情态动词有具体的词义,但也同助动词一样,需要与其他词语一起构成句子的谓语,另外情态动词没有人称和数的变化,情态动词后必须跟动词原形。
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