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

问题补充：

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

A. didn I realize

B. did I realize

C. I didn realize

D. I realized

答案：

A. didn I realize

(答案→)B. did I realize

C. I didn realize

D. I realized

解析：

试题分析:考查倒装句。Not until结构放在句首时，主句要用部分倒装语序，故排除C、D选项，因为not已经提至until从句前，后面不能再用否定词，所以B选项正确。句意：直到我辍学后，我才意识到我浪费了多少时间。