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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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
Many elderly people have to live on the money they ______ when they were working.
A．laid up
B．put back
C．set up
D．put aside
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