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; 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;
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