单项选择题

You ______ park here. It's an emergency exit for the fire brigade.

A．mustn't
B．needn't
C．wouldn't
D．oughtn't
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单项选择题
Do you think there's any ______ of him passing the exams.
A．chance
B．opportunity
C．occasion
D．expectancy
单项选择题
The policy ______ made, the next problem was how to carry it out.
A．having been
B．being
C．had been
D．was
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