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【题目】Public service adsalso PSAsoften _________ for free_________ to educate people about healthsafety or any other problem that affects public welfare.

A. runmeant B. are runare meant

C. are runmean D. runare meant

【答案】D

【解析】非谓语动词和固定搭配。句意:公益广告一般是免费播放,它们旨在向人们传递有关健康、安全或任何其它影响公共福利的问题等方面的知识。逗号之间的部分是插入语,是一个过去分词短语,PSAsrun之间是动宾关系,即公益广告被播放,应该用过去分词,排除BCbe meant/intended for sth/to do sth旨在......,相当于be aimed to do sth,故选D

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