选项
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;
正确答案：D
名词解析
D