单项选择题


A．countries
B．towns
C．districts
D．suburbs
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单项选择题
A．organizedB．commercializedC．realizedD．established
A．organized
B．commercialized
C．realized
D．established
单项选择题
A．unlessB．andC．howeverD．although
A．unless
B．and
C．however
D．although
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