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 extensive survey suggested that their assumptions ______totally wrong.
A．were
B．be
C．was
D．would be
单项选择题
A survey was carried out on the death rate of new-born babies in that region, ______ were surprising.
A．as results
B．which results.
C．the results of it
D．the results of which
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