单项选择题

A sneeze cannot be performed voluntarily, ________ be easily suppressed.

A．nor it can
B．it can not
C．nor can it
D．cannot it
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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
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
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