7. 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 realize
7. 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 realize
B。
not until引导的状语置于句首时，主句用部分倒装。