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
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
单项选择题
More than two hundred years ago the United States ______ from the British Empire and became an independent country.
A．got off
B．pulled down
C．broke away
D．dropped off
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