设单链表中结点的结构为typedef struct node{ file://链表结点定义 ElemType data; file://数据 struct node * Link; file://结点后继指针} ListNode;非空的循环单链表first的尾结点(由p所指向)满足:()
(A)p->link == NULL;
(B)p == NULL;
(C)p->link == first;
(D)p == first;
参考答案
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(A)p->link == NULL;
(B)p == NULL;
(C)p->link == first;
(D)p == first;