Not until to do my homework how much time I had wasted playing computer games.A. I began;

问题补充：

Not until to do my homework how much time I had wasted playing computer games.

A. I began; I realized

B. I began; did I realize

C. did I begin; I realized

D. did I begin; did I realize

答案：

A. I began; I realized

(答案→)B. I began; did I realize

C. did I begin; I realized

D. did I begin; did I realize

解析：考察倒装句。Not until放在句首时，后面的状语从句不要倒装，但是后面的主句应该使用部分倒装的形式。故B正确。