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
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With the help of the collected money, subways can be built sooner and better, _______ brings convenience to citizens.
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A
as
B
what
C
who
D
which
________is often the case, the weather has turned out well as expected.
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Which
B
When
C
What
D
As
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