单项选择题

You cannot be ______careful when driving a car on the superhighway.

A．very
B．too
C．so
D．enough
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单项选择题
He has been interested in computer since his childhood, so he specialized______ computer science when he was in college.
A．on
B．at
C．for
D．in
单项选择题
______put down the receiver when the telephone rang again.
A．Scarcely did she
B．Scarcely had she
C．Scarcely she
D．Scarcely she had
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