单项选择题

Although the United States has long been known as a nation of immigrants, ( ) discrimination still exists.

A．radical
B．racial
C．crucial
D．diplomatic
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单项选择题
When they had finished playing, the children were made to ( ) all the toys they had taken out.
A．put off
B．put up
C．put out
D．put away
单项选择题
It was almost dark in the street ( ) a few spotlights.
A．excluding
B．except for
C．except
D．but for
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