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 Afternumerousexperiments,somedoctorshavemadea

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問題詳情：

 Afternumerousexperiments,somedoctorshavemadea

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

A. breakdown         B. breakup

C. breakthrough       D. breakout

【回答】

C

知識點：名詞

題型：選擇題

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