----You forgot your purse when you went out.
------Good heavens,
A. so did I
B. so I did
C. I did so
D. I so did.
网友回答
A. so did I
(答案→)B. so I did
C. I did so
D. I so did.
解析：考查so的搭配。“so+同一主语+助动词/情态动词/系动词”表示前面的情况属实，意为：的确如此。句意：—你出来的时候忘记带钱包了。—我的天啊！的确如此。根据句意说明B正确。