题目内容
【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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