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
The sentence ______ White ______ his sister is coming to our help. is wrong.
A．Either; or
B．Neither; nor
C．Not only; but also
D．Both; and
单项选择题
The ______ boy was last seen ______ near the East Lake.
A．missing; playing
B．missing; play
C．missed; played
D．missed; to play
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