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    sufficient rest from work, the civil authorities are attempting to make a breakthrough in limiting working hours. A. Having ensured B. To ensure C. Ensured D. Ensuring 【查看更多】

     

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    ________ sufficient rest from work, the civil authorities are attempting to make a breakthrough in limiting working hours．

    [　　]
    A．

    To ensure

    B．

    Having ensured

    C．

    Ensured

    D．

    Ensuring

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