问题
选择题
_____ you can't treat the dog as a member of your family, I will still keep it myself. [ ]
A. Until
B. Though
C. If
D. After
答案
答案：C
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_____ you can't treat the dog as a member of your family, I will still keep it myself. [ ]
A. Until
B. Though
C. If
D. After
答案：C
及S分别表示样本均值和均方差，则