Not until my first book was put on the top 10 list writing could really make a difference in my life.
A. I knew
B. that I knew
C. did I know
D. that did I know
网友回答
A. I knew
B. that I knew
(答案→)C. did I know
D. that did I know
解析：考查倒装结构。not until等具有否定意义的词或短语置于句首时，主句要用部分倒装结构。故选C项。