题目

What worried the child most was his not _______ to visit his mother in the hospital. A . allowed B . allowing C . being allowed D . to allow 答案：C（2012?长清区模拟）甲、乙、丙三人行路，甲每分钟走60米，乙每分钟走50米，丙每分钟走40米．甲从A地，乙和丙从B地同时出发相向而行，甲和乙相遇后，过了15分钟又与丙相遇，求A、B两地间的距离．