This CD-ROM can help you learn and have fun .
A. at times
B. on time
C. at the same time
D. in time
网友回答
A. at times
B. on time
(答案→)C. at the same time
D. in time
解析：at times 有时，偶尔；on time按时，准时； at the same time 同时；in time及时。句意：这个光盘能帮助学习，并且同时玩乐。结合语境可知选C。