单项选择题

Unless ______ by credit card, please pay in cash.

A．pay
B．is paid
C．paying
D．paid
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单项选择题
He spoke in whispers ______ the servants should hear him.
A．so
B．so that
C．lest
D．in order that
单项选择题
Good travelers don't leave ______ on trains or airplanes.
A．rubbish
B．litter
C．garbage
D．pollutant
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