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

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

 

【答案】

D

【解析】

試題分析：句意為，你不必買(mǎi)禮物了，但是如果你愿意的話(huà)也可以買(mǎi)。根據(jù)句意可知此處須用否定形式，故排除A、C項(xiàng)；mustn’t 表示禁止；don’t have to 意為“不必……”，故選D。

考點(diǎn)：本題考查情態(tài)動(dòng)詞。

點(diǎn)評(píng)：情態(tài)動(dòng)詞有具體的詞義，但也同助動(dòng)詞一樣，需要與其他詞語(yǔ)一起構(gòu)成句子的謂語(yǔ)，另外情態(tài)動(dòng)詞沒(méi)有人稱(chēng)和數(shù)的變化，情態(tài)動(dòng)詞后必須跟動(dòng)詞原形。

 

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