单项选择题

His continual severe financial problems kept his mother in a ______ state of anxiety.

A．perpetual
B．eternal
C．everlasting
D．usual
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单项选择题
She has been awarded a ______ at Harvard University.
A．scholarship
B．federation
C．collision
D．collaboration
单项选择题
The American population is composed of people of different ______ backgrounds.
A．aesthetic
B．ethnic
C．athletic
D．ethic
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