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

Mary has a 15-year contract with the company. By June next year, Mary ______ with this company for 14 years.

[A] will have been working
[B] will have worked
[C] will work
[D] works

单项选择题

I purposely ______ from extending these observations to any length.

[A] abstain
[B] sustain
[C] retain
[D] detain

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