单项选择题

Education, reserved to the states or the people in the U.S., is a ______ of the state, not the federal government.

A．condition
B．performance
C．requirement
D．function
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单项选择题
If he had left in time for the last bus, he ______ it.
A．shouldn't have missed
B．ought not have missed
C．mustn't have missed
D．couldn't have missed
单项选择题
______ of what had happened to Lisa took all of us by surprise.
A．Word
B．Words
C．The word
D．The words
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