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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单项选择题

She thought I was talking about her son,（）, in fact, I was talking about my son.

A．whom
B．which
C．while
D．where

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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