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
She didn't know ______.
A．where she gets the book
B．where would she get the book
C．where getting the book
D．where to get the book
单项选择题
A thief is a danger to ______.
A．society
B．a society
C．the society
D．societies
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