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：B
解析：

解析：在until引導的時間狀語從句中，如果not until同時位于句首時，主句中的主語和謂語必須要倒裝，即“助動詞 (等) ＋主語＋動詞原形＋其他”，故選B。句意為：直到我開始工作我才意識到我浪費了多少時間。


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