问题补充：
-Can you tell me ?
- With Lucys 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
答案：
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：句意：你能告诉我你是怎么把它做得这么好的？是在露西的帮助下。根据句意应该是如何做，再根据宾语从句中必须使用陈述句的语序，故选C
