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Lawrence Craven, a doctor from the USA, is the author of several published reports, one of _______ i...
题目内容:
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
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