单项选择题

It took her several years to （）the habit of wild rabbits.

A．care
B．cultivate
C．look
D．observe

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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

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

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