问题补充：
---You forgot your pen when you went to have an exam.
---My God, .
A. so did I
B. so I did
C. I did so
D. I so did
答案：
A. so did I
(答案→)B. so I did
C. I did so
D. I so did
解析：考查倒装结构。So + 助动词 + 主语表示“的确如此”。句意：——你去考试的时候你忘了你的钢笔。——天哪，我确实忘了。
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