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
When we finally （）to get home after the tiring long journey, we could hardly move a step further.

A．tried
B．succeeded
C．managed
D．endeavored
单项选择题
He asked （）since he had been chairman for seven years.

A．not to have been re-elected
B．to be not re-elected
C．not to be re-elected
D．to have not been re-elected
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