单项选择题

Tariffs on imports are not as ______ right now as they have been in the past.

A．high
B．higher
C．highest
D．highly
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单项选择题
______ this computer network is a challenging job that requires a lot of expertise and effort.
A．Maintain
B．Maintaining
C．Maintenance
D．Maintained
单项选择题
The opening night of the film festival is always a wonderful ______ filled with glamor and excitement.
A．direction
B．occasion
C．conflict
D．connotation
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