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    精英家教网 > 高中英语 > 题目详情
    Scientists have achievedr a major_______ in the search for a cure for cancer, _____ is good news for those who suffer from cancer
    A．breakthrough; whatB．breakdown; which
    C．breakup; thatD．breakthrough; which
    D
    breakthrough 意思为 “突破”, a breakthrough in sth在某方面上的突破; which引导的非限制性定语从句, 指代前面句子的内容。
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