注意：此页面搜索的是所有试题
题目内容
（河北民族师范学院 -大学英语）
Building that railway was very difficult and involved _____ ten tunnels.
得分：5分
A.dig
B.throwing
C.to have thrown
D.having thrown
得分：5分
A.dig
B.throwing
C.to have thrown
D.having thrown
参考答案
