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 |
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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 |