假设以数组A[n]存放循环队列的元素，其头、尾指针分别为front和rear。若设定尾指针指向队列中的队尾元素，头指针指向队列中队头元素的前一个位置，则当前存于队列中的元素个数为()。
A.(rear-front-1) ％n
B.(rear-front) ％ n
C.(front-rear+1) ％n
D.(rear-front+n) ％n
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正确答案： B 答案分析：无
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