单项选择题

She pretended（）nothing had happened.

A. as
B. if
C. as though
D. since

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单项选择题

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

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

单项选择题

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

A. having been
B. to have been
C. being
D. to be

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