题目内容
Every possible means ______ to prevent the air pollution, but the sky is still not clear.
| A．has been used | B．have been used | C．is used | D．are used |
A
解析试题分析：句意：每种可能的方式都被使用过来阻止空气污染，但是天空还是不清楚。Means是单复数同形的单词，因为这里被every修饰，所以means这里是单数，谓语用单数，排除BD，从but the sky is still not clear. 可知这里强调的是已经被使用了，用现在完成时，选A.
考点：考查主谓一致和时态
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| A．would lie | B．lay | C．had lain | D．should lie |
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| A．is | B．were | C．was | D．are |
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| A．are | B．is | C．were | D．was |
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| A．is | B．are | C．was | D．were |
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| A．are | B．is | C．have | D．be |
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| A．is | B．are | C．have been | D．had heen |
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| A．were invited | B．was invited |
| C．have been invited | D．has been invited |