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
If only the committee ______ the regulations(规章) and put them into effect as soon as possible.
A．approve
B．Will approve
C．can approve
D．would approve
单项选择题
Mr. Morgan can be very sad ______ , though in public he is extremely cheerful.
A．by himself
B．in person
C．in private
D．as individual
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