问题
选择题
Not until I dropped off from school ____ how much time I had wasted.
A．didn't I realize
B．I realized
C．I didn't realize
D．did I realize
答案
答案：D
题目分析：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。