[题目]People of serious pollution.so they began to take action to protect the environment.A.warnedB.are warnedC.has been warnedD.were warned 题目和参考答案——青夏教育精英家教网——

题目内容

【题目】People ___________of serious pollution，so 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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