问题补充:
---You ought to have warned him of the danger!
--- ! But he wouldn’t listen!
A. So did I
B. So ought you
C. So I did
D. So I have
答案:
A. So did I
B. So ought you
(答案→)C. So I did
D. So I have
解析:句意:你本应该警告他有危险!我第五警告了,但是他不听。ought to have done 本该做某事而实际上没有做,so + 主语+ 助动词,表示对上句的肯定,根据语境警告的动作在过去所以用助动词did,故选C。