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
本題同時考查非限制性定語從句和名詞性從句中的同位語從句，故第一空用which，第二空用that。
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