Have you found ways to make waste water clean?改为被动语态

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• They have found ways to make waste water clean.的被动语态则怎么变?
• Have you found ways to make waste water clean?改为被动语态
• They have found ways to make waste water clean
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• The ways to make waste water clean have been found by them.翻译
• They have found a way to make waste water clean.如何让改为被动语态
• Have you found ways to make waste water clean?改为被动语态
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