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 manager gave one of the salesgirls an accusing look for her ______ attitude toward customers.
A．straightforward
B．partial
C．favourable
D．hostile
单项选择题
Scientists are ______ certain that there is a cancer--inhibiting agent in the blood of the shark.
A．dubiously
B．virtually
C．queerly
D．randomly
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