设指针q指向单链表中结点A,指针p指向单链表中结点A的后继结点B,指针s指向被插入的结点X,则在结点A和结点B间插入结点X的操作序列为( )。A:p->next=s;s->next=q; B:q->next=s; s->next=p; C:p->next=s->next;s->next=p; D:s->next=p->next;p->next=-s; 答案: q->next=s; s->next=p;