单项选择题

Some folk songs have been（）down from one generation to another.

A. sent
B. gone
C. come
D. passed

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For passengers, ships have the advantage of（）cheaper than trains or planes.

A. having been
B. to have been
C. being
D. to be
单项选择题
Only under special circumstances（）to take make-up tests.

A. are freshmen permitted
B. freshmen are permitted
C. permitted are freshmen
D. are permitted freshmen
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