theworldhealthorganizationgaveawarningtothepublicwithoutany()whenthevirusofH1N1hitmexicoinapril,2009
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题目内容：
the world health organization gave a warning to the public without any()when the virus of H1N1hit mexico in april ,2009
优质解答
A.delay
当H1N1病毒袭击墨西哥的时候,
世界卫生组织没经一点耽搁地向公众发布了一个警告.
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