单项选择题

There is no denial that in the tropical area there is a high ______of malaria.

A．incident
B．incidence
C．accident
D．precedent
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单项选择题
In the law court, the suspect couldn't ______his time that night.
A．count on
B．account
C．account for
D．count
单项选择题
They gained great influence by ______themselves to prominent city institutions.
A．detaching
B．assigning
C．dispatching
D．attaching
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