【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. keep

【答案】C

【解析】句意:保持家鄉(xiāng)的整潔和美麗是我們的職責(zé)。我們必須為它做點(diǎn)什么。keep動(dòng)詞,保持。本句是固定句型:It’s +名詞+to do sth., 意為...某事是...”。動(dòng)詞不定式是真正的主語。故選:C。

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