单项选择题

Turn off the light before you ______.

A．leave
B．left
C．had left
D．is leaving
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单项选择题
-- May I stop here -- No, you ______.
A．mustn't
B．might not
C．needn't
D．won't
单项选择题
All the rooms are ______ with electric light.
A．supplied
B．given
C．offered
D．burnt
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