题目

If it were for me to decide, I would have done more than ________ the locks. A . having changed B . changing C . changed D . change 答案：D到目前为止，大陆上各省省会（自治区首府）尚未有铁路与首都北京相通的是： [　　]  A. 西宁　　B. 乌鲁木齐　　C. 拉萨　　D. 呼和浩特