Weour breakfast when an old man came to the door.A. just have hadB. have just hadC. just h

问题补充：

Weour breakfast when an old man came to the door.

A. just have had

B. have just had

C. just had

D. had just had

答案：

A. just have had

B. have just had

C. just had

(答案→)D. had just had

解析：吃饭的动作在来的动作之前，考查过去完成时的用法。