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问题描述:

[单选] 设rear是指向非空带头结点的循环单链表的尾指针,则在起始结点之前插入指针p所指结点的操作可表示为()
A.p->next = rear->next->next; rear->next = p B.p->next = rear->next; rear->next->next = p C.p->next = rear->next->next; rear->next->next = p D.p->next = rear->next->next; rear->next->next = p->next
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