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【题目】People have changed their ways of life to protect the environment. (改为被动语态)

People's ways of life ________ changed to protect the environment.

【答案】have been

【解析】

句意:为了保护环境,人们改变了生活方式。

将原句改为被动语态,主语people's ways of life表复数概念,且时态为现在完成时,故此处应为现在完成时的被动语态have been done。故答案为have been

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