已知 L 是带头结点的单链表,且 P 结点既不是首元结点,也不是尾元结点,在 P 结点的后继结点的语句序列是( )
A.
S=P; P->next=P->next->next; free(S);
B.
S=P->next; P->next=P->next->next; free(S);
C.
P->next=P->next->next; S=P->next; free(S);
D.
P->next=P->next->next; S=P; free(S);
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