21.9.2. 简单易学 chrry带你逐句学柯林斯英语会话 火车多久一趟?

21.9.2. 简单易学 柯林斯英语会话 火车多久一趟? Collins English Conversation Unit 2 Travelling 21 page 28 Asking for information How often …? How often do the trains go? 火车多久一趟 How often do the trains to Cambridge go? 去剑桥的火车多久一趟？ How often do the buses to Edinburgh go? 去爱丁堡的公交车多久一趟？