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【题目】It’s our duty our hometown clean and beautiful.

We must do something for it.

A. keeping B. keeps C. to keep D. kept

【答案】C

【解析】句意:保持我们的家乡干净和美丽是我们的职责。It是形式主语,真正的主语是不定式to keep our hometown clean and beautiful.故选C

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