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【题目】--It’s our duty______our city clean and beautiful.-Yes.We should do something for it

A. to keep B. keep C. keeps

【答案】A

【解析】

句意:-保持我们的城市干净和美丽是我们的职责。-是的,我们应该为此做点事。to keep动词不定式;keep保持,动词原形;keeps第三人称单数形式。这句话中使用了句型It is one’s duty to do sth.做某事是某人的职责,故这里用动词不定式,选A。

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