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    【题目】In the past few decades, scientists have made a great ________ in the treatment of cancer.

    A. breakout B. breakdown C. breakup D. breakthrough

    【答案】D

    【解析】

    考查动词短语辨析。

    句意：过去几十年里，科学家在癌症的治疗方面取得了巨大的突破。A. 发生 B. 故障；崩溃 C. 解体,分手，放假 D. 突破。故选D。

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