⏪ 新概念英语 - [3-034] - (97版) ⏩ ⏳ 正在检测本地文件... Listen to the tape then answer the question below.听录音，然后回答下面的问题。What was the 'happy discovery'? 什么是‘幸运的发现’？A happy discovery 📁 请先导入本地文件， 需要帮助？点击我 ↗