單項選擇題

在一個雙鏈表中,在*p節(jié)點之前插入節(jié)點*q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;

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