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    30．It is strongly recommended that the machine until it has been fully checked． A．is not used B．will not be used C．not be used D．is not to be used 【查看更多】

     

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    It is strongly recommended that the machine ________ until it has been fully checked．

    A．is not used                                                B．will not be used

    C．not be used                                               D．is not to be used

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