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
Criticism and self-criticism is necessary ______ it helps us to find and correct our mistakes.
A．by that
B．at that
C．on that
D．in that
单项选择题
However, at times this balance in nature is ______ , resulting in a number of possibly unforeseen effects.
A．troubled
B．disturbed
C．confused
D．puzzled
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