Mark was a student at this university from 2006 to 2011，________he studied very hard and was made Chairman of the Students’ Union.
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A
during which time
B
for which time
C
during whose time
D
by that time
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The old professor has three sons，________are doctors.
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A
all of them
B
all of whom
C
all of that
D
all of which
Great changes have taken place in that school. It is no longer _______ it was 20 years ago, _______ it was so poorly equipped.
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A
that; which
B
what; when
C
what; which
D
which; that
The ordinary house _________ we visited three days ago used to be the house of Victor Hugo, a well-known litterateur(文学家).
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A
what
B
where
C
to which
D
不填
Finally they arrived at a place _____ sold cigarettes and some other bargains.
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A
where
B
which
C
when
D
what