问题
选择题
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
答案
答案：D
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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：D