[题目]It's our duty our environment clean.A.keepB.to keepC.keepingD.for keeping 题目和参考答案——青夏教育精英家教网—

题目内容

【题目】It's our duty our environment clean.
A.keep
B.to keep
C.keeping
D.for keeping

【答案】B
【解析】句意：保持环境干净是我们的责任。句型：It's one's duty to do sth。做某事是某人的责任。it作形式主语，指代后面的不定式。故选B。

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