在一个双向中,在*p节点之前插入*q节点的操作是__________。
A.
p->prior=q; q->next=p; p->prior->next=q; q->prior=p->prior;
B.
q->prior=p->prior; p->prior->next=q; q->next=p; p->prior=q->next;
C.
q->next=p; p->next=q;q->prior->next=q; q->next=p;
D.
p->prior->next=q; q->next=p;q->prior=p->prior;p->prior=q;