Not unti his fellows criticized him to admit his mistake.
A. does he begin
B. did he begin
C. began he
D. had he begun
网友回答
A. does he begin
(答案→)B. did he begin
C. began he
D. had he begun
解析：not until 位于句首，句子使用部分倒装。观察句子，从criticized可知句子应与过去有关，排除A；C答案为完全倒装。