若L是一个无表头结点的单链表，P结点既不是首结点，也不是尾结点。删除P结点的后继结点的语句是 (57) 。

A．P→ next = P→next→next; Q=P→next; free(Q);
B．Q = P → next; P → next = P → next→next; free(Q);
C．P → next → next = P → next; Q = P → next; free(Q);
D．Q = P → next; P → next → next = P→next; free(Q);