单项选择题


A．are
B．did
C．do
D．would
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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
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
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