单项选择题

Probability is the mathematical study of the ______of an event's occurrence.

A．predictability
B．possibility
C．feasibility
D．undesirability
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单项选择题
He said that under more favorable conditions, he ______in China to find a good job and settle down at that time.
A．would have stayed
B．would stay
C．had stayed
D．stay
单项选择题
In the bank he changed his pounds for the ______amount of dollars.
A．identical
B．similar
C．equivalent
D．same
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