Lawrence Craven, a doctor from the USA, is the author of several published reports, one of which introduced the idea in 1953 ________ aspirin could reduce the risk of heart attacks by thinning blood.
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A
when
B
where
C
that
D
which
推荐题目
The reason_________ he didn't come was _________ he had to take care of his sick mother.
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A
why ; that
B
why ; which
C
which ; why
D
that ; for
Her son was accused of cheating by the police, ________ made it difficult for her to go to sleep.
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A
what
B
as
C
which
D
where
I borrowed several books from the library, ________ are about English study.
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A
two of them
B
and two of which
C
two of which
D
two of what