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(2013·山东，26)Mark needs to learn Chinese________his company is opening a branch in Beijing.
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unless
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until
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although
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since
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Is this research center ________ you visited the modern equipment last year?
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where
B
that
C
the one that
D
the one where
One can always manage to do more things，no matter________full one’s schedule is in life.                                                                  
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A
how
B
what
C
when
D
where
They arrived at a farmhouse, in front of ______sat a small boy.
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whom
B
who
C
which
D
that
 Many athletes are clear that the Olympic Games are the only time ________ they will be watched by thousands of millions.
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A
that
B
which
C
where
D
when
 Up to Tuesday's attack, the worst school shooting in the U. S. was in March 1998 in Jonesboro,______two boys, aged 11 and 13, shot and killed a teacher and four girls.
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while
B
where
C
when
D
then