－Could you tell me ?－By practicing conversations with friends.A. when do you learn English

问题补充：

－Could you tell me ?

－By practicing conversations with friends.

A. when do you learn English

B. when you learn English

C. how you learn English

D. how do you learn English

答案：

A. when do you learn English

B. when you learn English

(答案→)C. how you learn English

D. how do you learn English

解析：英语宾语从句中一般为陈述语序。根据下文，通过和朋友练习对话。可知上文问的是，你能告诉我你是如何学英语的吗？结合语境可知选C。