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—It’s our duty our city clean and beauti...

It’s our duty   our city clean and beautiful.

Yes. We should do something for it.

A. to keep         B. keep         C. keeping

 

A 【解析】选A。考查动词不定式的用法。It’s +adj. /n. +to do sth. 句式结构中, it是形式主语, 动词不定式(短语)是真正主语。  
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