问题补充:
This CD-ROM can help you learn and have fun.
A. at times
B. on time
C. at the same time
D. in time
答案:
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。