◎ 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
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“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 …”主要考查了你对  【关系代词】【非限制性定语从句】【同位语从句】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。