单项选择题

China is one of the largest ______ in the world.

A．country's
B．countrys
C．countries
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单项选择题
Be sure ______ your hands before you have meals.
A．to wash
B．wash
C．washing
单项选择题
Peter's father is a heavy smoker ______ a heavy drinker.
A．as
B．as well as
C．as well
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