单项选择题

There is no point _________ the piano, unless you practice every day.

A．to learn to play
B．in learning to play
C．by learning to play
D．having learned to play
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单项选择题
Beijing has cut its birth-rate _________ almost 60 percent in the past 20 years.
A．to
B．by
C．for
D．with
单项选择题
He took down a square green bottle, _________ he poured into a dish.
A．its content
B．which content
C．the content of which
D．the content of that
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