Question

wonder how have you

--I wonder how you have improved your spoken English so fast，Li Lei．
--__________ chatting with my foreign friend，Mike．He's been here for some time，you know．（　　）

A. By

B. With

C. In

D. On

Answer 1

答案：A．by doing sth"通过（或靠）某方式、方法"，提问者想知道李雷的英语口语提高如何那么快，回答者应该告诉他提高英语口语的方法，by chatting with"通过聊天的方法"．故选A．