单项选择题

The bird flew into the air and was soon ______ .

A．out of sight
B．in a hurry
C．at a loss
D．for good
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单项选择题
You'd better hurry, ______ you might be late for class.
A．or
B．and
C．unless
D．but
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
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