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This CD-ROM can help you learn and have fun ______.
A.at timesB.on timeC.at the same timeD.in time
C
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。
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