单项选择题

You won't be able to finish the job _______ you stop playing around.

A．unless
B．lest
C．in case of
D．so that
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单项选择题
Would you please _______ a seat for this evening’s concert
A．reserve
B．preserve
C．conserve
D．save
单项选择题
The information -office at the station _______ that all trains were running about one hour behind time.
A．advertised
B．declared
C．determined
D．promised
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