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

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问题 We ______ our breakfast when an old man came to the door.

选项 A、just have had
B、just had
C、have just had
D、had just had

答案D

解析 本题测试的是动词时态的用法。关键在于了解just的用法,一般与完成时连用且放在助动词与实义动词之间使用。因此本题答案为D。
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