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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; whenB.which; thatC.what; thatD.which; when

B

解析试题分析:考查定语从句。本定语从句的先行词是reports,which指代reports作为of的宾语。第二空的定语从句先行词是1953,本定语从句结构很完整,所以使用关系副词when。故B正确。
考点:考查定语从句
点评:定语从句的关键在于分析句子成分,如果句子很完整就使用冠词副词;如果句子中缺少主语,宾语,表语或者定语则使用关系代词。

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