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【题目】It is necessary for us students _______________ the listening ability.

A. to improve B. improving C. improve D. improves

【答案】A

【解析】

句意:对我们学生来说提高听力能力是必要的。选项中improve为实义动词意为“改善、提高”,A项为不定式形式;B项为现在分词形式;C项为原形;D项为单三形式根据句型It is+形容词+(for sb)to do sth对某人来说做某事是……,故此处用动词不定式to improve,故选A。

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