◎ 题干
— Mary, why didn't you come yesterday?
— I _____, but I had an unexpected visitor.

A. had
B. did
C. would
D. was going to
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“— Mary, why didn't you come yesterday? — I _____, but I had an unexpected visitor. [ ]A. had B. did C. would D. was going to …”主要考查了你对  【过去进行时】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。