All possible means ___ been tried to stop the air______.A.has, pollutedB.have, pollutingC.have, bein

题目简介

All possible means ___ been tried to stop the air______.A.has, pollutedB.have, pollutingC.have, bein

题目详情

All possible means ___ been tried to stop the air______.
A.has, pollutedB.have, polluting
C.have, being pollutedD.has, being polluted
题型:单选题难度:偏易来源:不详

答案

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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