单项选择题

He called her names ,so she won't forgive him ______ he makes an apology to her.

A．although
B．once
C．if
D．unless
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单项选择题
When you cross the street, you can never be ______ careful.
A．much
B．very
C．too
D．so
单项选择题
The forest guards often find campfires that have not been ______ completely.
A．turned down
B．put out
C．put away
D．turned over
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