We___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 by the time不是用将来完成时?
问题描述：
We___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
by the time不是用将来完成时?
答
We___our breakfast when an old man came to the door.
选 D. 老人进来的时候是发生在过去,我们吃饭是过去的过去,因此用过去完成时.