单项选择题

It is everybody's ______ to keep the city clean.

A．matter
B．affair
C．business
D．thing
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单项选择题
—I'm going to the post office. — ______ you axe there, can you get me some stamps
A．As
B．While
C．Because
D．If
单项选择题
Jack ______ yet, otherwise he would have telephoned me.
A．mustn't have arrived
B．shouldn't have arrived
C．can't have arrived
D．need not have arrived
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