---Can you tell me ?
---With Lucy’s help.
A. when you did it so well
B. when did you do it so well
C. how you did it so well
D. how did you do it so well
网友回答
A. when you did it so well
B. when did you do it so well
(答案→)C. how you did it so well
D. how did you do it so well
解析：考查宾语从句。宾语从句使用陈述句语序，B、D两项did在主语前，是疑问语序，排除B、D；根据答语“在露西的帮助下”可知，问的是“怎样完成的那么好”，用how提问，故选C。