◎ 题干
Lawrence Craven, a doctor from the USA, is the author of _____ several published reports, one of
introduced the idea in 1953 _____ aspirin could reduce the risk of heart attacks.

[     ]

A. them; when
B. which; that
C. what; that
D. which; when
◎ 答案
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◎ 解析
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◎ 知识点
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