【題目】It is our duty _________our hometown clean and beautiful. We must do something for it.

A. to keep B. keeps C. keeping

【答案】A

【解析】句意：保持我們家鄉(xiāng)的干凈和美麗是我們的職責(zé)。這里考查的是it is+名詞+to do sth.結(jié)構(gòu)。故選A。

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