⏪ 新概念英语 - [3-040] - (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。How did the policeman discover that the whole thing was a joke? 警察如何发现整件事是个玩笑？Who's who 📁 请先导入本地文件， 需要帮助？点击我 ↗