看这句：
He had had a long and uncomfortable trip, for he had been confined to the wooden box for over eighteen hours.
中的“had had ”在语法上怎么解释？

have +过去分词，构成完成时态。例如：

　　   He has left for London.　他已去了伦敦。

　　   By the end of last month, they had finished half of their work.　 上月未为止，他们已经完成工作的一半。

这里的第二个“had”是过去分词，构成过去完成时态。

[此贴子已经被作者于2006-8-4 15:02:45编辑过]

谢谢2楼的朋友解释，明白了