—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：
D。由于见朋友发生在过去(即昨天)，而很久没有见到朋友自然是昨天的见面之前，即属于过去的过去，故用过去完成时。