单项选择题

If law and order ______ not preserved, people will not be able to live a secure life. ( )

A．are
B．were
C．is
D．was
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单项选择题
You ______ our case very convincingly. The jurors were clearly impressed. ( )
A．represented
B．presented
C．promoted
D．probed
单项选择题
The weather being unfavorable, they had to ______ the sports meet. ( )
A．put out
B．put off
C．put up
D．put on
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