22．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
网友回答
A. them; when
(答案→)B. which; that
C. what; that
D. which; when
解析：考查从句。第一个空考查定语从句，which 用于介词后指代前文的reports。第二个空是由that引导同位语从句。具体说明idea的详细内容。