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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I will always remember the days_____ I spent with you in that village.
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A
on that
B
in which
C
when
D
that
---What do you think of teaching , Bob？ ---I find it fun and challenging. It is a job ___you are doing something serious but interesting
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A
where
B
which
C
when
D
that
The company has recently taken on fifty new workers some of_______ have just graduated from university.
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A
which
B
them
C
those
D
whom