The water will be polluted unless some measures _____.A．will be takenB．are being
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The water will be polluted unless some measures _____.| A．will be taken | B．are being taken | C．are taken | D．were taken |
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答案
| C |
解析
| 考察时态及语态。句意：除非采取了一些措施，否则这些水会被污染。句子描述的是一个过去的动作，故用过去时态，measures是take的动作对象，故用被动语态，选D。 |
举一反三
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