单项选择题
One thing he felt regret for was that he never had the ______ of hearing him play the piano.
A．occassion
B．possibility
C．opportunity
D．chance
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单项选择题
There is less crime now than there used to be. It seems that there is a ______ in the crime rate.
A．slope
B．incline
C．descent
D．decline
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单项选择题
He's working hard for fear that he ______.
A．should fall behind
B．fell behind
C．may fall behind
D．would fall behind
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