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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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
单项选择题
Only when you have acquired a good knowledge of grammar ______ write correctly.
A．you will
B．you can
C．can you
D．can't you
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