问题
选择题
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
答案：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. One
C. If
D. Although
答案：D
