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【题目】People ___________of serious pollutionso they began to take action to protect the environment.

A.warnedB.are warnedC.has been warnedD.were warned

【答案】D

【解析】

句意:人们被警告严重的污染,所以他们开始采取行动保护环境。

考查时态和语态。warned一般过去时的主动形式;are warned一般现在时的被动形式;has been warned现在完成时的被动形式;were warned一般过去时的被动形式。根据began此处用一般过去时,此处主语people与谓语warn之间是被动关系,因此用一般过去时的被动形式,故选D

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