单项选择题

The two scholars worked at the task of writing a preface to the new dictionary for three hours ______ last night.

A．at length
B．in full
C．on end
D．in time
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You ______ park here. It's an emergency exit for the fire brigade.
A．mustn't
B．needn't
C．wouldn't
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Do you think there's any ______ of him passing the exams.
A．chance
B．opportunity
C．occasion
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