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    精英家教网 > 高中英语 > 题目详情
    Scientists have made a major ____ in cancer research.
    A．break-inB．breakthrough
    C．breakupD．breakdown
    4. B
    句意为“科学家们在癌症研究方面取得了一次重大突破。”。 make a breakthrough表示“取得突破”，为固定搭配。
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