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7.So far,several cases of a disease,         as H1N1,are reported to have been found in the country.(  )
A.knowingB.to be knownC.having knownD.known

分析 到目前为止,几个病例,即为人所熟知的H1N1,据报道已经在这个国家被发现.

解答 答案:D 句中有逗号分隔,没有连词,要用非谓语动词;be known as被人熟知,know与disease构成动宾关系,且句意表达的是客观事实,要用过去分词形式.故选D.

点评 过去分词是非谓语动词的一种,用法很灵活,分为简单式done(表示与谓语同时或几乎同时发生的动作);完成式having been done(表示先于谓语的动作).学习时,要把握其用法特征:表示被动和完成.同时还要注意区分现在分词和不定式.

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