It's our duty our hometown clean and beautiful. We must do something for it.A. keeping B. keepsC. to keep D. keep C [解析]句意:保持家乡的整洁和美丽是我们的职责.我们必须为它做点什么.keep动词.保持.本句是固定句型:It’s +名词+to do sth., 意为题目和参考答案——青夏教育精英家教网—

题目内容

It's our duty ________ our hometown clean and beautiful. We must do something for it.

A. keeping B. keeps

C. to keep D. keep

C 【解析】句意：保持家乡的整洁和美丽是我们的职责。我们必须为它做点什么。keep动词，保持。本句是固定句型：It’s +名词+to do sth., 意为“做...某事是...”。动词不定式是真正的主语。故选：C。

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