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
Then it was Jerry's duty to cautiously ______ the arrow had it missed the mark.
A．recover
B．regain
C．refund
D．retrieve
单项选择题
Students in this university are forbidden ______ out of the main gates of the university after 11 p.m.
A．going
B．to go
C．having gone
D．their going
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