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8、________ 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

8、D

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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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