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