王老师:19139051760(拨打)复制微信 题目 更新时间:2023/4/3 10. Building that railway was very difficult and involved _____ ten tunnels.A. dig B. throwing C. to have thrown D. having thrown 答案 登录 注册 B 出自:青书学堂 >> 河北建筑工程学院-建筑工程技术(专科)-大学英语1 河北建筑工程学院继续教育学院