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.
Probably no man had more effect on the daily lives of most people in the United States ________ Henry Ford, a pioneer in automobile production.
A. as was B. than was C. than did D. as did
It was only after he had spent several nights digging around the cross ________ he decided to write to Kit Williams to find out if he was wasting his time there.