在循环双链表的 p 所指结点之后插入 s 所指结点的操作是( ) A. p->next=s; s->prior=p; p->next->prior=s; s->next=p->next; B. p->next=s; p->next->prior=s; s->prior=p; s->next=p->next; C. s->prior=p; s->next=p->next; p->next=s; p->next->prior=s; D. s->prior=p; s->next=p->next; p->next->prior=s; p->next =s;