— How do you study English so well?— I study reading English magazines.A. atB. onC. inD.

问题补充：

— How do you study English so well?

— I study reading English magazines.

A. at

B. on

C. in

D. by

答案：

A. at

B. on

C. in

(答案→)D. by

解析：根据语境可知此句的含义是我通过读英语杂志来学习英语.通过某种方式做某事常用介词by,其后常跟动词的ing形式.故选D.