--You ought to have given them some advice. but who cared what I said?A. so I amB. so

问题补充：

--You ought to have given them some advice.

--, but who cared what I said?

A. so I am

B. so am I

C. so did I

D. so I did

答案：

A. so I am

B. so am I

C. so did I

(答案→)D. so I did

解析： 考查句型：so +主语+ 助动词，表示对上句的认同，so + 助动词 +主语，是倒装，主语也是上句主语的情况。根据句意：你本应该给他们提一些建议的。我的确提了，但是谁会在乎我说的呢？提建议的动作在过去，故用助动词did,选D。