It is our duty_our hometown clean and beautiful. We must do something for it.[ ]A. to keepB. keepsC. keeping-初中英语-n多题

◎ 题干

It is our duty _ our hometown clean and beautiful. We must do something for it.

[ ]

A. to keep
B. keeps
C. keeping

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◎ 解析

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◎ 知识点

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