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.
A.them; whenB.which; thatC.what;thatD.which; when
B
本题同时考查非限制性定语从句和名词性从句中的同位语从句,故第一空用which,第二空用that。
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