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_____ is our duty _____ the environment.

A.This; protect B.It; to protect

C.This; protecting D.It; protect

B

【解析】

试题分析:根据固定句型It’s one’s duty to do表示做某事是某人的职责。句意:保护环境是我们的职责。结合句意,故选B

考点:考查固定句型。

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