单项选择题

From the writer's observation, we can see that fires break out in Tokyo ______.

A．occasionally
B．not very often
C．quite frequently
D．twice a day
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单项选择题
Once environmental damage ______, it takes many years for the system to recover.
A．is done
B．has done
C．will be done
D．is to be done
单项选择题
Have your files protected when working on the computer, ______ you might have them deleted by accident.
A．while
B．so
C．and
D．or
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