28. The environment was ________ because the air was full of acid and metallic aerosol
particles.
(A) sanitary
(B) mercurial
(C) noxious
(D) unsoiled
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統計: A(17), B(25), C(248), D(20), E(0) #1334280
統計: A(17), B(25), C(248), D(20), E(0) #1334280