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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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