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53.We _D_ our breakfast when an old man came to the door.

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53.We _D_ our breakfast when an old man came to the door.
  A just have had B have just had C just had D had just had
为什么选D,D项中为什么是 had just had
53.We _D_ our breakfast when an old man came to the door.
D had just had
老人进门的时候,我们已经吃完早餐了.
老人进门发生在过去,吃完饭比老人进门发生得要早,所以用过去完成时.
第一个had是过去完成时的格式,第二个had 是have 的过去分词,是实意动词,吃饭的意思