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    28． how to operate the machine, the young man started it like a skilled worker． A．Instructing B．Being instructed C．Having instructed D．Having been instructed 【查看更多】

     

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    _______ how to operate the machine, the young man started it like a skilled worker．

    A．Instructing                            B．Being instructed

    C．Having instructed                D．Having been instructed

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