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All possible means ___ been tried to stop the air______. A.has, polluted B.have, polluting .
Allpossiblemeans___beentriedtostoptheair______.A.has,pollutedB.have,pollutingC.have,b...
All possible means ___ been tried to stop the air______. A.has, polluted B.have, polluting C.have, being polluted D.has, being polluted
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C |
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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