单项选择题

You have to be patient if you want to sustain your position.

A．maintain
B．establish
C．acquire
D．support
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单项选择题
The index is the government's chief gauge of future economic activity.
A．measure
B．opinion
C．evaluation
D．decision
单项选择题
They agreed to modify their policy.
A．clarify
B．change
C．define
D．develop
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