We had just had our breakfast when an old man came to the door 句首的两个had分别代表什么?

We had just had our breakfast when an old man came to the door 句首的两个had分别代表什么?

过去完成时结构是:had+过去分词。句中第一个had是构成过去完成时的成分。第二个had是have的过去分词,和breakfast组成短语表示“吃早餐”。
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