单选题
17.
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
【正确答案】
D
【答案解析】
“吃早饭”(have breakfast)这一动作发生在“来”之前，而“来”这个动作用的是过去时态，因此“吃早饭”应该用过去完成时。
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