--You have made great progress in English．

--________．That's why I got an A in the English exam．

A．So I have             B．So have I             C．So I do               D．So do I

－You have made great progress in English.　　

－____. That's why I got an A in the English exam.

A. So I have

B. So have I

C. So I do

D. So do I