So far, several cases of a disease, as H1N1, are reported to have been found in the countr

发布时间：2020-08-16 08:58:00


So far, several cases of a disease,     as H1N1, are reported to have been found in the country. 
A. knowing
B. to be known
C. having known
D. known

网友回答

A. knowing
B. to be known
C. having known
(答案→)D. known
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