单项选择题

No one would have time to read or listen to an account of everything ______ going on in the world.

A．it is
B．which is
C．that is
D．what is
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单项选择题
Unless ______ by credit card, please pay in cash.
A．pay
B．is paid
C．paying
D．paid
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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