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

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

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

You have found ways to make waste water clean?不知道对不对