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______scientistshavedonealotofresearchonA(H1N1)flu,ther...

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問題詳情：

______scientistshavedonealotofresearchonA(H1N1)flu,ther...

______ 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

【回答】

D

知識點：連詞

題型：選擇題

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