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This also keeps the air,soil,water crops________ chemicals.
A.out ofB.out fromC.free ofD.rid of
C

试题分析:固定搭配free of…免受…的伤害;句义:这个总是能够让空气,土壤和水生物免受化学物质的伤害。根据句义说明C正确。
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