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

14、C

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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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