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【单选题】
利用二分查找算法查找序列中的某一个数是否存在，如果序列总共有15个元素，而第一次查找时发现序列中的第8个元素大于要查找的元素，则需要进行的赋值操作是()?A.
low=mid+1
B.
low=mid-1
C.
high=mid+1
D.
high=mid-1
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