词组“listen in on”是什么意思?

词组“listen in on”是什么意思? listen in on 是什么意思好像是个固定词组吧 不记得什么意思了 put on weight的反意词组是什么 in oder to 是什么词组 怎么记忆decide on词组用on不用in? 复习的英文词组是什么on的 词组go on an outing中文是什么? enjoyed tremendous popularity,alike,run(上演),on end,are required,in full的同义词或词组是什么? in the morning的对应词组是什么 in the morning的对应词组是什么 词组 put in order 的意思是什么? in a car的同义词组是什么 Listen tothe tape ,and write() the answer A.in.B.on.C.downD.on to 举行的单词词组是hold on 还是hold in 初中英语on in as of from 的词组 词组,是ceremony前加at还是in ,on? What fun it is to listen to music in bed on rainy days.为什么to listen to music (not talk)in class .listen to the teacher they want (have)shopping on weekdays(not talk)in class .listen to the teacherthey want (have)shopping on weekdays