单项选择题

We must () the United States five years in order to apply for citizenship.

A．reside in
B．accommodate
C．invade
D．abandon

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单项选择题

Air is the mixture of gases in which () the gas is oxyen.

A．not every of
B．not all
C．none of
D．all of

单项选择题

I'm sorry I'm late, I was held up in a traffic ().

A．block
B．group
C．jam
D．bunch

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