题目内容
A human case of H7N9 was reported in 2014 when a woman______ to be infected with the bird flu virus.
A. confirmed B. had been confirmed
C. was confirmed D. have confirmed
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题目内容
A human case of H7N9 was reported in 2014 when a woman______ to be infected with the bird flu virus.
A. confirmed B. had been confirmed
C. was confirmed D. have confirmed