14、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
科目：高中英語 來源： 題型：
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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