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

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单项选择题
All I'm trying to do is to （）why your condition has not improved.

A．look for
B．find out
C．search for
D．get in
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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