单项选择题

The birth control measures have helped to ______ the city's population.

A．hold up
B．hold off
C．hold on
D．hold down
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单项选择题
Don't turn the stove off; the meat ______.
A．is cooked
B．has been cooked
C．is being cooked
D．is cooking
单项选择题
We produced ______ we did two years ago.
A．double as much cotton as this year
B．twice as much cotton this year as
C．this year twice cotton as much as
D．twice as this year much cotton as
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