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
My classmate asked me
A． whether did I look like my mother
B． whether I look like my mother
C． whether do I look like my mother
单项选择题
He was noticed ______ open the window.
A． breaking
B． broke
C． broken
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