单项选择题

The policemen went into action ______ they heard the alarm.

A．promptly
B．quickly
C．presently
D．directly
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单项选择题
______, work songs often exhibit the song culture of a people in a fundamental form.
A．They occur where they are
B．Occurring where
C．Wherever they occur
D．Where do they occur
单项选择题
In American universities, classes are often arranged in more flexible ______ and many jobs on campus are reserved for students.
A．scales
B．ranks
C．grades
D．patterns
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