Not until I dropped off from school how much time I had wasted.A. didn't I realizeB. I re

问题补充：

Not until I dropped off from school how much time I had wasted.

A. didn I realize

B. I realized

C. I didn realize

D. did I realize

答案：

A. didn I realize

B. I realized

C. I didn realize

(答案→)D. did I realize

解析：考查倒装句：句意：直到我在学校下降了，我才意识到浪费了多少时间。Not until引导时间状语从句，放在句首的时候，主句用部分倒装，因为前面有not，主句部分的谓语是肯定的，选D。