【題目】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：保持我們的家鄉(xiāng)干凈和美麗是我們的職責(zé)。It是形式主語(yǔ)，真正的主語(yǔ)是不定式to keep our hometown clean and beautiful.故選C

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