单项选择题

In the advanced course students must take performance tests at monthly _________.

A．gaps
B．intervals
C．length
D．distance
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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
单项选择题
The candidate arrived _________ at 8 o'clock for the job interview.
A．directly
B．punctually
C．promptly
D．immediately
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