10． scientists have done a lot of research on Aflu.there are still some cases for further st——青夏教育精英家教网—

摘要：10． scientists have done a lot of research on Aflu.there are still some cases for further study． A．As B．Once C．If D．Although

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________ scientists have done a lot of research on A（H1N1）flu，there are still some cases for further study．

A．As B．Once C．If D．Although

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