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Thewaterwillbefurtherpollutedunlesssomemeasures.[]A.willbetakenB.aretakenC.weretakenD.hadbeentaken
题目详情
| The water will be further polluted unless some measures _____. |
| [ ] |
| A. will be taken B. are taken C. were taken D. had been taken |
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答案和解析
| B |
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