-I watched the TV program last night.-- .A. So I doB. So I didC. So did ID. So do I

问题补充：

---- I watched the TV program last night.

---- .

A. So I do

B. So I did

C. So did I

D. So do I

答案：

A. So I do

B. So I did

(答案→)C. So did I

D. So do I

解析：表示和上句一样的情况，可用so+助动词+人称，本题是过去时，故助动词用did，故本题选C。