问题补充：
Not until I began to work 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：
A. didn’t I realize
(答案→)B. did I realize
C. I didn’t realize
D. I realized
解析：本题考查倒装结构。not until引导状语从句位于句首时，主句要倒装，故选B。句意：直到我开始工作我才意识到我已经浪费了多少时间。
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