单项选择题

The mail was ______ for a week because of the flood.

A．held in
B．hold on
C．hold off
D．hold down
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单项选择题
______ , criticize him.
A．Should any one misbehave in class
B．Any one should misbehave in class
C．If any one were misbehaves in class
D．Would any one misbehave in class
单项选择题
______ , a TV set is in use in every home for about six hours each day.
A．It is average
B．The average that
C．On the average
D．On average
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