问题:
A、p->next=s; p->next->prior=s; s->prior=p; s->next=p->next;
B、s->next=p; s->next=p->next; p->next=s; p->next->prior=s;
C、p->next=s; 3->prior=p; p->next->prior=s; s->next=p->next;
D、s->prior=p; s->next=p->next; p->next->prior=s; p->next=s;
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