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With more factories and traffic, the air of the city is much dirtier than _____ of the suburbs.

A. it
B. that
C. one
D. those
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科目:高中英语 来源:0127 模拟题 题型:单选题

With more factories and traffic, the air of the city is much dirtier than _____ of the suburbs.
[     ]
A. it
B. that
C. one
D. those

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