单项选择题

A．But
B．And
C．Or
D．So
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单项选择题
A．wereB．areC．usedD．had been
A．were
B．are
C．used
D．had been
单项选择题
A．that isB．it isC．it wasD．which is
A．that is
B．it is
C．it was
D．which is
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