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He was often seen _________ with charity work last year.
A.to helpB.helpedC.helpingD.help
A

试题分析:see后面宾语可以接现在分词,不带to的不定式和过去分词作宾语补足语,不过含义不同. see sb. doing 表示看见某人正在做某事;see sb. do 表示看见某人做过某事;see sb. done 表示看见某人被…句意:去年(有人)经常看见他帮助慈善团体工作.结合语境可知本句指的是看见他做过某事.在被动语态中,省略的不定式符号要加上,故选A.
点评:此类题型主要是确定句子主语与谓语动词的关系。如果是主动关系则用主动语态,反之如果是动宾关系,则用被动语态。注意一些接不带to的不定式做宾语补足语的动词用作被动语态时,不定式符号to要加上。
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