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
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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
The goals ______ he had fought all his life no longer seemed important to him.
A．after which
B．for which
C．with which
D．for that
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