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Every possible means to prevent the air pollution, but the sky is still not clea

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Every possible means to prevent the air pollution, but the sky is still not clea

Every possible means ________ to prevent the air pollution, but the sky is still not clear.

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A．is usedB．are usedC．has been usedD．have been used

试题答案

答案：C

解析：

考查主谓一致的用法．根据句意，应用被动语态，排除A、B；句中means前有every修饰，谓语要用单数．

标签：airthepollutionskybut

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