单项选择题

Unemployment seems now to be regarded by some economists as _________ part of societies concerned with controlling inflation.

A．a feature
B．an exponent
C．a component
D．an exposed
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单项选择题
In the advanced course students must take performance tests at monthly _________.
A．gaps
B．intervals
C．length
D．distance
单项选择题
The two schoolboys were so angry with each other that they had a _________ fight.
A．sit-down
B．knock-down
C．sit-up
D．stand-up
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