Not until I to work how much time I had wasted.A. did begin; didn’t I realizeB. began; I

问题补充：

Not until I to work how much time I had wasted.

A. did begin; didn’t I realize

B. began; I realized

C. did begin; I realized

D. began; did I realize

答案：

A. did begin; didn’t I realize

B. began; I realized

C. did begin; I realized

(答案→)D. began; did I realize

解析：本题考查倒装句。否定词Not until位于句首，主语要用部分倒装，但从句不倒装。句意：直到我开始工作我才意识到我浪费了多少工作。根据语境应用过去式，所以选D