A、p->prior->next=p->next; p->next->prior=p->prior;
B、p->prior=p->prior->prior ;p->prior->next=p;
C、p->next->prior=p ;p->next=p->next->next
D、p->next=p->prior->prior ;p->prior=p->next->next;
A、p->prior->next=p->next; p->next->prior=p->prior;
B、p->prior=p->prior->prior ;p->prior->next=p;
C、p->next->prior=p ;p->next=p->next->next
D、p->next=p->prior->prior ;p->prior=p->next->next;
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