"I study by listening to tapes"中的"by"有什么用

"I study by listening to tapes"中的"by"有什么用 I study by listening to tapes.是什么从句? by listening to tapes翻译 1 by 2 study 3 listening 4 to 5 I 6 tapes I study by listening to sapes. I syudy by listening to tapes.这句中by的意思是什么? l study by listening to tapes for the test .对划线部分提问 划线部分by l She learn English (by listening to tapes)(对括号提问) by listening to tapes为什么要加ing She said she ____ her listening skills by listening to tapes 英语翻译How do you study for a test?I study by listening to tape 英语翻译How do you study for a test?I study listening to tapes.H