单项选择题

You cannot be ______ careful when you drive a car.

A. very
B. so
C. too
D. enough
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单项选择题
Human facial expressions differ from those of animals in the degree to which they can be ______ controlled and modified.
A. deliberately
B. consequently
C. originally
D. absolutely
单项选择题
Keys should never be hidden around the house since thieves ______ know where to look.
A. virtually
B. initially
C. invariably
D. infinitely
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