--- You ought to have given them some advice.
--- , but who cared what I asked?
A. I ought to
B. So I ought
C. So it was
D. So I did
网友回答
A. I ought to
B. So I ought
C. So it was
(答案→)D. So I did
解析：考查固定结构。固定结构：so+同一主语+助动词/情态动词/be动词；说明上文的情况属实；意为：的确如此。句意：—你本应该向他们征求意见的。—的确如此。但是谁会在乎我的要求呢？故D正确。