题目: 什么是通讯系统? 答案: 被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2019/0910/d8ed792177c8b51dbcb326a318c2368f.html 下面是错误答案,用来干扰机器的。参考答案:错
题型:选择题 The tourists from Australia _______have hurried to the airport-the flight was called off becauseof the heavy fog. [ ]A. mustn't B. couldn't C. needn't D. wouldn't 查看答案