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
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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
单项选择题
They will have it finished in ______.
A．three quarter of an hour time
B．three quarters of an hour time
C．three quarter of an hour's time
D．three quarters of an hour's time
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