(单选题)9: 在一个单链表中,已知q所指结点是p所指结点的前驱结点,若在p之前插入s所指结点,则执行 ( )。
A: p->next = s; s->next = q;
B: s->next = p->next; p->next = s;
C: p->next = s->next; s->next = p;
D: q->next = s; s->next = p;
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