Allpossiblemeans___beentriedtosto

发布时间:2020-07-11 17:39:50

All possible means ___ been tried to stop the air______













A.has, polluted












B.have, polluting











C.have, being polluted











D.has, being polluted

网友回答

C解析第一空考查主谓一致means是单复同形的名词本句中有all视为复数;第二空考查短语stop …(from)…“阻止做某事”空气应是被污染要用动名词的被动式。句意为:已经尝试了所有的方法来阻止空气被污染。选C
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