【題目】It’s our duty our city clean and beautiful.

Yes. We should do something for it.

A. to keep B. keep C. keeping

【答案】A

【解析】選A?疾閯釉~不定式的用法。It’s +adj. /n. +to do sth. 句式結(jié)構(gòu)中, it是形式主語, 動詞不定式(短語)是真正主語。

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