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.
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A
them; when
B
which; that
C
what; that
D
which; when
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How do you guess ________?
#77434
A
did they finish the work within so short a time
B
they finished the work within so short a time
C
had they finished the work within so short a time
D
will they finish the work within so short a time