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    23．The scientist has been greatly successful in the experiment that he to do three years ago. A．set off B．set down C．set about D．set out 【查看更多】

     

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    The scientist has been greatly successful in the experiment that he _____ to do three years ago.

    [     ]

    A. set off
    B. set down
    C. set out
    D. set about

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