do you learn English so well?chatting with my pen pal in America online.A. How; WithB. Wha

问题补充：

do you learn English so well?

chatting with my pen pal in America online.

A. How; With

B. What; With

C. How; By

D. What; By

答案：

A. How; With

B. What; With

(答案→)C. How; By

D. What; By

解析：句意：你是怎么学好英语的？通过和我美国的笔友在线聊天。How怎样，询问方式方法；by通过，by doing sth.通过做某事。故选C。