单项选择题

Now everyone is concerned about how to conquer the economic crisis（）is very important for us to be able to preserve our standard of living.

A. which success
B. its success
C. the success of which
D. the success of it

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单项选择题
So far this year we（）a fall in house prices by between 5 and 10 percent．

A．saw
B．see
C．had seen
D．have seen
单项选择题
It seems water（）from this tap for some time. We'll have to take it apart to put it right.

A. had leaked
B. is leaking
C. leaked
D. has been leaking
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