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--When was the first man with A flu in mainland China known for sure? -- May 11, 2009. A. In B. On C. For D. Since 答案:B 【查看更多】

 

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－When was the first man with A(H1N1)flu in mainland China known for sure?

－________ May 11, 2009．

[　　]

A．In

B．On

C．For

D．Since

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