--How do you improve your listening skill, Mary? ----I often do it tapes and English r

----How do you improve your listening skill, Mary?
----I often do it tapes and English radios.
A. by hearing
B. in listening to
C. by listening to
D. for listening

A. by hearingB. in listening to(答案→)C. by listening toD. for listening解析：句意：Mary,你是怎么提高听力技能的？我经常通过听磁带和英语电台来提高。By doing sth.通过做某事，by表示方式，故选C。

我好好复习下