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
The patient knew nothing about his illness（）the doctor told him.

A．after
B．while
C．until
D．since
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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