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They arrived at a farmhouse，in front of ________ sat a small boy.
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A
whom
B
who
C
which
D
that
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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.
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A
them; when
B
which; that
C
what; that
D
which; when
The reason _____ he refused to attend the meeting was that they didn't give him an  invitation earlier.
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A
how
B
why
C
which
D
that
Here are some Christmas presents, ____you can choose one for yourself.
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A
in which
B
from which
C
between which
D
through which
I like the second football match ____ was held last week.                              
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A
which
B
who
C
that
D
/
 New York, ______ I visited last year, is a nice old city.
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A
that
B
which
C
where
D
in which