问题
选择题
Not until I began to work ____ realize how much time I had wasted. [ ]
A. didn't I
B. did I
C. I didn't
D. I
答案
答案：B
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Not until I began to work ____ realize how much time I had wasted. [ ]
A. didn't I
B. did I
C. I didn't
D. I
答案：B