单项选择题

The waterfall_______the rocks.

A．wears down
B．wears off
C．wears away
D．wears out
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单项选择题
Mary likes_______very much but she doesn't like _______ with strangers.
A．dancing; dancing
B．dancing; to dance
C．to dance; dancing
D．to dance; to dance
单项选择题
Few pleasures can equal_______of a cool drink on a hot day.
A．that
B．some
C．any
D．those
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