选项
A.
A.p->next=s; s->prior=p; p->next->prior=s; s->next=p->next;
B.
B.p->next=s; p->next->prior=s; s->prior=p; s->next=p->next;
C.
C.s->prior=p; s->next=p->next; p->next=s; p->next->prior=s;
D.
D.s->prior=p; s->next=p->next; p>next->prior=s; p->next=s;
正确答案：D