【題目】People have changed their ways of life to protect the environment. (改為被動語態(tài))

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

【答案】have been

【解析】

句意:為了保護環(huán)境,人們改變了生活方式。

將原句改為被動語態(tài),主語people's ways of life表復數(shù)概念,且時態(tài)為現(xiàn)在完成時,故此處應為現(xiàn)在完成時的被動語態(tài)have been done。故答案為have been

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