单项选择题

You'd better hurry, ______ you might be late for class.

A．or
B．and
C．unless
D．but
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单项选择题
Are you conscious ______ any reason why he should not be enrolled in this university
A．of
B．with
C．about
D．on
单项选择题
The explorers ______ into the unknown regions of the Amazon River.
A．penetrated
B．injected
C．reached
D．stretched
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