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    We all think our duty to tidy the lab after the experiment. A. this B. that C. / D. it 【查看更多】

     

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    We all think ________ our duty to tidy the lab after the experiment．

    [　　]
    A．

    this

    B．

    that

    C．

    /

    D．

    it

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    We all think ________ our duty ________ tidy the lab after the experiment.

    [　　]

    A．that, to
    B．which, for
    C．it, to
    D．this, to

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    We all think ________ our duty ________ tidy the lab after the experiment.

    [　　]

    A．that, to
    B．which, for
    C．it, to
    D．this, to

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