单项选择题

--She was in class on Friday afternoon, but no one has seen her since.
--She ______ an accident.

A．might have
B．might have had
C．may have
D．ought to have had
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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
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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