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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