题目

—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：D 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。

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