问题 更新时间2023/4/3 12:59:00 25. It has been over a century _______ the railway was completed.(本题1.0分) A、 when B、 once C、 which D、 since 答案 登录 注册 标准答案:D 出自:青书学堂 >> 漯河职业技术学院大学英语1(高起专)