单项选择题

The medicine is on sale everywhere. You can get it at ______ chemist's.

A．each
B．some
C．certain
D．any
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单项选择题
You cannot be ______ careful when you drive a car.
A．very
B．so
C．too
D．enough
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
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