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
Living in the central Australian desert has its problems, ______ obtaining water is not the least.
A．for which
B．to which
C．of which
D．in which
单项选择题
______shall we forget the day when we received the admission into Harvard University.
A．No time
B．Never
C．No sooner
D．Nonetheless
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