单项选择题

______for their help, we would not have overcome the difficulties.

A．Weren't
B．Had it not been
C．Hadn't it been
D．Had it been not
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单项选择题
You cannot be ______careful when driving a car on the superhighway.
A．very
B．too
C．so
D．enough
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
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