Not until to do my homework how much time I had wasted playing puter 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
网友回答
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。