问题
选择题
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
答案
答案：C
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。