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
It is only when you nearly lose something______you will fully realize how much you value it.
A. before
B. that
C. do
D. will
单项选择题
You rarely have breakfast at home, ______you
A. do
B. don’t
C. have
D. haven’t
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