单项选择题
A.p=p->next;s->next=p;p->next=s; B.p=p->next;s->next=p->next;p->next=s; C.s->next=NULL;p=p->next;p->next=S; D.p=(*.next;(*.next=(*.next;(*.next=s;
A.ABCDEF B.DBEAFC C.ABDECF D.DEBFCA