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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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
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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