You ought to have given them some advice but who cared what I asked?A. I ought

问题补充：

--- 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

答案：

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。