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