单项选择题

Some college students in China maintain a casual correspondence with their former high school teachers.

A．occasional
B．indifferent
C．careless
D．frequent
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单项选择题
Economists and government officials are trying to get at the cause of the current inflation.
A．discover
B．eliminate
C．inaugurate
D．devise
单项选择题
Companies can maintain good business relations by abiding by their promises and agreements.
A．coming up with
B．breaking away from
C．living up to
D．getting rid of
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