13、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
科目:高中英语 来源: 题型:
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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