单项选择题

Since the matter was extremely ______, we dealt with it immediately.

A．tough
B．tense
C．urgent
D．instant
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You cannot be _____careful when you drive a car.
A．very
B．so
C．too
D．enough
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
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