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【题目】Your computer is old and slow. It is necessary_________ a new one.

A.to buyB.buyC.to makeD.make

【答案】A

【解析】

句意:你的电脑又旧又慢。有必要买一个新的了。

to buy买,动词不定式;buy动词原形;to make制作,动词不定式;make动词原形。根据句意可知,这里应表示“买一个新电脑”,而不是制作一个,先排除CD。该句使用了句型It is+形容词+to do sth.“做某事是……的”,It是形式主语,动词不定式作真正的主语。故选A

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