More people are moving to the suburb because the air there is much fresher than _____ in the city.

A. one
B. it
C. that
D. those
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科目：高中英語 來源：云南省模擬題 題型：單選題

More people are moving to the suburb because the air there is much fresher than _____ in the city.
[     ]
A. one
B. it
C. that
D. those

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