By 16:30, ______was almost closing time, nearly all the paintings had been sold.
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A
which
B
when
C
what
D
that
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A huge amount of oil was spilt on the East Sea, the causes of ______ are still under investigation.
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A
it
B
that
C
which
D
whom
I have a big dream — I want to go into space, _______ will take some time to realize, I guess.
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A
which
B
it
C
what
D
where
is recorded in the history book , Diaoyu Island has belonged to China since ancient times.
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A
As
B
That
C
Which
D
What
、The virtues of thrift（节俭）and hard work is vital for everyone, is often the case in any society.
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A
as
B
that
C
when
D
where
Now everyone is concerned about how to conquer the economic crisis, __________is very important for us to preserve our standard of living．
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A
which success
B
its success
C
the success of which
D
the success of it