请选择DCBA)k._;B.u-?7}/^8_0R ---_________ do you improve your listening?:H3I,J-y5K
--- I improve it _________ listening to tapes.:H3I,J-y5K
A. What, by:H3I,J-y5K
B. How, by:H3I,J-y5K
C. What, with:H3I,J-y5K
D. How, on:H3I,J-y5K