()did the 2010 World Expo(世博会)last?-----------For six months.A.How often B.How long C.How soon

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()did the 2010 World Expo(世博会)last?-----------For six months.A.How often B.How long C.How soon
()did the 2010 World Expo(世博会)last?-----------For six months.A.How often B.How long C.How soon

()did the 2010 World Expo(世博会)last?-----------For six months.A.How often B.How long C.How soon
B 问多长时间,表持续,应用how long ,回答中用for + 时间
A 问的是频率; C 多久

B.How long