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:词义辨析。at times有时,偶尔;on time按时,准时;at the same time同时;in time及时。句意:这种光碟能帮助你学习同时又很有趣。所以选C。