单项选择题


A．and
B．though
C．when
D．as
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单项选择题
A．disagreeB．divergeC．varyD．deviate
A．disagree
B．diverge
C．vary
D．deviate
单项选择题
A．wereB．areC．usedD．had been
A．were
B．are
C．used
D．had been
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