单项选择题

The government has strictly carried out the policy of birth control, thus resulting in the ______ of the population in our city.

A．turning down
B．dropping out
C．leveling off
D．holding up
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I regretted ______the expensive air-conditioner.
A．not to afford
B．not affording
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It must have rained yesterday evening, ______ the ground is wet.
A．since
B．while
C．for
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