单项选择题

He waited for the bus for an hour. ______.it arrived.

A．At last
B．At once
C．In time
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单项选择题
We are in line. Ben is standing between ______ .
A．I and she
B．me and her
C．her and me
单项选择题
He was noticed ______ open the window.
A．breaking
B．broke
C．broken
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