问题
选择题
Not until David came up to me, _____. [ ]
A. I noticed him
B. I did notice him
C. did I notice him
D. had I noticed him
答案
答案：C
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Not until David came up to me, _____. [ ]
A. I noticed him
B. I did notice him
C. did I notice him
D. had I noticed him
答案：C