—Did Alan enjoy seeing his old friends yesterday?
—Yes,he did.He his old friends for a long time.
A. didn’t see
B. wouldn’t see
C. hasn’t seen
D. hadn’t seen
网友回答
A. didn’t see
B. wouldn’t see
C. hasn’t seen
(答案→)D. hadn’t seen
解析：过去完成时表示一个动作或状态在过去某一时间或动作之前已经完成或结束,也可能是早已完成或结束,即“过去的过去”;也可以指过去的动作延续到过去的某个时刻。根据题意可判断出和她的朋友见面发生在昨天,在昨天以前他们很长时间没有见面了。