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题文

Scientists have achieved a major ___ in the search for a cure for cancer, ____ is good news for those who suffer from cancer.

A.breakthrough; what B.breakdown; which
C.breakup; that D.breakthrough; which
科目 英语   题型 单选题   难度 较易
知识点: 名词+of 表示数量 非限制性定语从句
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