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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 较易
  • 浏览 896

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
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Sofar,severalcasesofadisease,a