It is our duty our hometown clean and beautiful. We must do something for it.A. to keep B. keeps C. keeping 题目和参考答案——青夏教育精英家教网——

题目内容

It is our duty _________our hometown clean and beautiful. We must do something for it.
A. to keep B. keeps C. keeping

A

这里考查的是it is + 名词 + to do sth.结构。故选A。

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