单项选择题

It's amazing that two researchers working independently made the same discovery ______ .

A．spontaneously
B．simultaneously
C．collaboratively
D．conscientiously
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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
The manager gave one of the salesgirls an accusing look for her ______ attitude toward customers.
A．straightforward
B．partial
C．favourable
D．hostile
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