LawrenceCraven,adoctorfromtheU

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更新 2022-09-03
科目英语
题型单选题
难度中等
浏览 777

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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