单项选择题

I’m not surprised you failed the exam. You ( ) have worked harder.

A．should
B．must
C．would
D．ought
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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
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
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