--Did Alan enjoy seeing his old friends yesterday?--Yes, he did. He ________ his old friends for a long time.A.didn't seeB.wouldn't seeC.hasn't seenD.hadn't seen
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D解析句意：--昨天艾伦见到他的老朋友高兴吗？--高兴，他很长时间没有看到他的老朋友了。根据题干可知enjoy是过去发生的动作，而not see这一动作发生在enjoy之前，即过去的过去，故用过去完成时，因此