I met one of my old schoolmates yesterday.I-her for several

筒子,因为前面一句说了是昨天见着我的同学的,就是说在昨天之前我已经没看见她好几年了,没见着的动作是发生在在遇见之前,所以是过去的过去,所以说用过去完成时.选B.
现在完成是从过去发生的动作持续到现在,对现在有影响,比如说I have had an apple.(所以现在不饿）.而过去式I had an apple.就是过去发生的动作,与现在无关了.
过去完成时是用来表示发生在过去的过去的动作.比如说昨天在看比赛之前我吃了一个苹果：I had had an apple before the match started yesterday.
希望能对你有点帮助!