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    21．It is wise of you to well trained workers un-trained ones in the assembly line. A．substitute; for B．substitute; with C．replace; by D．replace ; for 【查看更多】

     

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    It is wise of you to________ well trained workers _______ un-trained ones in the assembly line.

    A．substitute; for         B．substitute; with           C．replace; by           D．replace ; for

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