单项选择题

Did you know ______ with the bike

A. what did he do
B. he did what
C. what he did
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单项选择题
Computer is ______ invention.
A. so an important
B. such an important
C. such important
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
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