单项选择题

You should ________ your room now and then to keep it supplied with fresh air.

A．ventilate
B．versatile
C．verify
D．versify
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单项选择题
Only in recent years ________ begun to realize the importance of Internet.
A．people have
B．have people
C．that people have
D．since have people
单项选择题
I do not doubt ________ he will appear soon.
A．that
B．whether
C．if
D．whatever
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