单项选择题

The house isn't comfortable tonight ______our air conditioner is not working.

A．so
B．because
C．once
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单项选择题
The young man refused ______the old man's advice.
A．to listen
B．to listen to
C．listen to
单项选择题
The teacher reminds the boys ______late for the meeting.
A．not be
B．to be
C．not to be
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