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    23．It is that the WHO gave a warning to the public immediately when the virus of H1N1 first hit Mexico in April, 2009. A. unwise B. sure C. certain D. unlikely 【查看更多】

     

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    It is ________ that the WHO gave a warning to the public immediately when the virus（病毒） of H1N1 first hit Mexico in April, 2009.

    A．unwise            B．sure               C．certain             D．unlikely

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