◎ 题干
So far, several cases of a disease, _____ as bird flu, are reported to have been found in the country.

A. knowing
B. to be known
C. having known
D. known
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“So far, several cases of a disease, _____as bird flu, are reported to have been found in the country. [ ]A. knowing B. to be known C. having known D. known …”主要考查了你对  【过去分词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。