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When was the first man with A(H1N1)flu in mainland China kno

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When was the first man with A(H1N1)flu in mainland China known for sure?_______May11,2009 A,In
B.On C.For D.Since
When was the first man with A(H1N1)flu in mainland China kno
On
你可以记住口诀:at时间点,有on必有天,in指月季年,也和色相连
就是说,有具体的时间点的时候用at,具体那一天用on,说到月份,季节,年份,就用in ;而且说谁穿了什么颜色的衣服的时候,也是用in XX(color)