第24题: [单项选择]Through a procedure known as time-sharing, one large computer can be employed (simultaneously) by lots of small users. A. ahead of time B. all the time C. at the same time D. in time 参考答案:C 答案解析:at the same time“同时”。ahead of time“提前”;all the time“一直”;in time“及时地”。本题译文:通过共享,这台大型计算机可以同时被许多用户使用。