单项选择题

I'm not sure whether I can gain any profit from the investment, so I can't make a (an) ______ promise to help you.

A．accurate
B．defined
C．definite
D．sure
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单项选择题
Things went well for him during his early life but in middle age his ______ seemed to change.
A．chance
B．luck
C．career
D．opportunity
单项选择题
We should concentrate on sharply reducing interest rates to pull the economy out of ______.
A．rejection
B．restriction
C．retreat
D．recession
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