问个英语句子,过去式和过去完成时的辨别.

问个英语句子,过去式和过去完成时的辨别.
老人与海的开头：He was an old man who fished alone in a skiff in the Gulf Stream and he had gone eighty-four days now without taking a fish.In the first forty days a boy had been with him.
最后一句 In the first forty days a boy had been with him.
语法书上说过去完成时是过去的过去,
可是这个句子in the first forty days不是过去的时间吗?
为什么不是a boy was with him?哪里体现了过去的过去?

in the first forty days.有first当然就有second、third…,而且冠词in表示在这第一个四十天内那个男孩一直陪在老人身边.

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