Many city people like to live in the country which is free___pollution.填介词,并说明理由!

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Many city people like to live in the country which is free___pollution.填介词,并说明理由!
Many city people like to live in the country which is free___pollution.
填介词,并说明理由!

Many city people like to live in the country which is free___pollution.填介词,并说明理由!
of
be free of...没有,免于...