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    28．Great efforts to increase agricultural production must be made if food shortage avoided． A．is to be B．can be C．has been D．will be 【查看更多】

     

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    Great efforts to increase agricultural production must be made if food shortage _____ avoided．

    A．is to be            B．can be            C．has been            D．will be

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    Great efforts to increase agricultural production must be made if food shortage ________ avoided．

    [　　]

    A．is to be

    B．can be

    C．will be

    D．has been

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    Great efforts to increase agricultural production must be made if food shortage _____ avoided.

    A．is to beB．can beC．has beenD．will be

    查看答案和解析>>

    Great efforts to increase agricultural production must be made if food shortage _____ avoided.

    A．is to be           B．can be            C．has been          D．will be

     

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