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