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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I saw a boy in the supermarket yesterday, reminded me of my good friend.
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A
that
B
who
C
where
D
which
A turning point of the continuously high housing price won’t appear suddenly because there must be a certain process ______ many factors lead to the change.
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A
which
B
what
C
where
D
that
The factory produces half a million pairs of shoes every year,80%________ are sold abroad.
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A
of them
B
which of
C
of which
D
of that
Leaving behind family members, these farmers are strangers to the cities ______ they work.
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A
in that
B
at which
C
where
D
which