题目内容

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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