Little what you said. I wish you had repeated it!
A. did I understand
B. I understood
C. I did understand
D. have I understood
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(答案→)A. did I understand
B. I understood
C. I did understand
D. have I understood
解析：否定词little位于句首，句子应用部分倒装，助动词位于主语之前。故选A。