问题
选择题
The H1N1 flu spread very quickly at the beginning, _____, many people were ill. [ ]
A. therefore
B. instead
C. in advance
D. however
答案
答案：A
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The H1N1 flu spread very quickly at the beginning, _____, many people were ill. [ ]
A. therefore
B. instead
C. in advance
D. however
答案：A