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The waste water, when _______,should be clean enough to meet standards.
A.releasingB.being releasedC.releasedD.to be released
C

试题分析:句意:废弃的水在排放时,应该被净化到符合标准。When引导时间状语从句,完整的句子应该为“When the waste water is released, it should be clean enough to meet standards.”当从句主语和主句的主语一致,而且从句谓语动词为be动词时,从句中的主语和谓语动词可以省略,故原句可以省略成“When released, the waste water should be clean enough to meet standards.”故选C。
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