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
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
单项选择题
（）I saw the machine, I could not have imagined how efficiently it works.

A．But for
B．Because
C．But that
D．If
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