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    After numerous experiments, some doctors have made a in the treatment of cancer. A. breakdown B. breakup C. breakthrough D. breakout 【查看更多】

     

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    After numerous experiments, some doctors have made a ________ in the treatment of cancer.
    [     ]
    A. breakdown  
    B. breakup  
    C. breakthrough  
    D. breakout

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     After numerous experiments, some doctors have made a _____ in the treatment of cancer.

    A. breakdown         B. breakup

    C. breakthrough       D. breakout

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