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    【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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