问题:[选择题]
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;s→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;
● 参考解析