单项选择题

John has never been ______ a plane.

A．abroad
B．above
C．absorb
D．aboard
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单项选择题
If only I ______ how to operate a computer as you do.
A．had known
B．would know
C．should know
D．knew
单项选择题
The building is ______ that one.
A．high as twice as
B．as twice high as
C．twice as high as
D．as high twice as
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