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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 较易
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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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LawrenceCraven,adoctorfromtheU