23．It is that the WHO gave a warning to the public immediately when the virus of H1N1 first——青夏教育精英家教网—

摘要：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

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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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