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