◎ 题干
         scientists have done a lot of research on A (H1N1) flu, there are still some cases for further study.    
[     ]
A. As    
B. One    
C. If    
D. Although
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“ scientists have done a lot of research on A (H1N1) flu, there are still some cases for further study.[ ]A. AsB. OneC. IfD. Although…”主要考查了你对  【状语从句】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。