There is no doubt a high-speed maglev train is very good, but I doubt it will do harm to the environment. A．that; whether B．whether; that C．that ; that D．whether; whether 【查看更多】
题目列表(包括答案和解析)
There is no doubt _____ a high-speed maglev train is very good, but I doubt _____ it will do harm to the environment.
[ ]
A. that; whether B. whether; that C. that ; that D. whether; whether
