单项选择题

Computer is ______ invention.

A. so an important
B. such an important
C. such important
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单项选择题
When I got to the airport, the plane ______.
A. already took off
B. had already taken off
C. has already taken off
单项选择题
What's file ______ today It's June 26.
A. day
B. date
C. time
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