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
When he explained it again and again, the student's patience ______ .
A．ran over
B．ran on
C．ran out
D．ran off
单项选择题
______ she is a likeable girl, she is very difficult to work with.
A．Since
B．However
C．As far as
D．While
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