题目内容
改写句子
Dirty water from factories pollute many lakes and rivers. (改成被动语态)
Many lakes and rivers ________ ________ ________ dirty water from factories.
答案：
解析：
解析：
|
are ,polluted ,by |
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题目内容
改写句子
Dirty water from factories pollute many lakes and rivers. (改成被动语态)
Many lakes and rivers ________ ________ ________ dirty water from factories.
|
are ,polluted ,by |