(单选题)3: 若给定的关键字集合为{20,15,14,18,21,36,40,10},一趟快速排序结束时,键值的排列为( )。
A: 10,15,14,18,20,36,40,21
B: 10,15,14,18,20,40,36,21
C: 10,15,14,20,18,40,36,21
D: 15,10,14,18,20,36,40,21
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