23. —Did Alan enjoy seeing his old friends yesterday?

—Yes, he did. He ___D___ his old friends for a long time. (2007重庆卷)

A. didn’t see                               B. wouldn’t see

C. hasn’t seen                             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。

33. When I called you this morning, nobody answered the phone. Where ___C___? (2007重庆卷)

A. did you go                              B. have you gone

C. were you                                D. had you been

【解析】C。句子的前半句说上午打电话时没有人接电话，而后半句问对方当时在什么地方。显然，句子前后两部分的时间应一致，即用一般过去时。