Not until finished my homework to watch TV.
A. I had; I began
B. had I; I began
C. I had; did I begin
D. had I; did I begin
网友回答
A. I had; I began
B. had I; I began
(答案→)C. I had; did I begin
D. had I; did I begin
解析：考查倒装句。Not until 为否定词放在句首，使用部分倒装，从句不倒装，主句倒装。根据时态，所以选C。