every means_stop the air from being polluted in that small towna are used to
every means_stop the air from being polluted in that small towna
a are usde to b is used to c get used to d used to
人气：318 ℃ 时间：2019-10-11 19:07:31
解答
b
every后跟单数名词,因此means在此不要把它当成复数,其意思为“方法”,是个单复数同形的名词；
“被动与做某事”be used to do sth
句意：每种方法都被用阻止空气被污染
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