问题
选择题
—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
答案
答案：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。