单项选择题

Don't smoke until the plane ______ off. ( )

A．takes
B．took
C．has taken
D．had taken
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单项选择题
A thief is a danger to ______.
A．society
B．a society
C．the society
D．societies
单项选择题
Had he come earlier, he ______ my brother. ( )
A．would meet
B．shall meet
C．shall have met
D．would have meet
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