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So far, several cases of a disease,        as bird flu, are reported to have been found in the country.
A.knowingB.to be knownC.having knownD.known
D
考查非谓语。know 与cases为动宾关系所以用过去分词作定语。到目前为止据知是禽流感的几个病例在这个国家被发现并报道。
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