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
The price of beer ______ from 50 cents to 4 dollars per liter during the summer season.
A．altered
B．ranged
C．separated
D．differed
单项选择题
If the whole operation ______ beforehand, a great deal of time and money would have been lost.
A．was not planned
B．has not been planned
C．had not been planned
D．were not planned
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