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：高中英語 來源：0127 模擬題 題型：單選題

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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