赞题库-背景图
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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热门试题

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