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.
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
B. which; that
C. what; that
D. which; when
B
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