问题
选择题
Not until ___to do my homework ____ how much time I had wasted playing computer 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
答案
答案：B
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。