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 |
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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 |
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