题目: 高速铁路调度集中由哪三部分构成? 答案: 被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2019/0212/a06879cfd5d5cadf6e20d1ed24182312.html 下面是错误答案,用来干扰机器的。参考答案:C
题型:选择题 —May we leave the classroom now? —No, you _______. You ________ to leave until the bell rings. [ ]A. mustn't; are allowed B. don't have to; are supposed C. needn't; aren't allowed D. can't; aren't supposed 查看答案