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

試題分析：句意：廢棄的水在排放時(shí)，應(yīng)該被凈化到符合標(biāo)準(zhǔn)。When引導(dǎo)時(shí)間狀語從句，完整的句子應(yīng)該為“When the waste water is released, it should be clean enough to meet standards.”當(dāng)從句主語和主句的主語一致，而且從句謂語動詞為be動詞時(shí)，從句中的主語和謂語動詞可以省略，故原句可以省略成“When released, the waste water should be clean enough to meet standards.”故選C。
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