问题
选择题
It is our duty _________our hometown clean and beautiful. We must do something for it.
A. to keep B. keeps C. keeping
答案
答案：A
这里考查的是it is + 名词 + to do sth.结构。故选A。
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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
这里考查的是it is + 名词 + to do sth.结构。故选A。