Instead of boring old textbooks which are quickly_____ you can have an interactive learning experience through MOOCs.<br> <br>A、upgraded<br>B、updated<br>C、out of date

Instead of boring old textbooks which are quickly_____ you can have an interactive learning experience through MOOCs.

A、upgraded
B、updated
C、out of date

出自：国家开放大学网络实用技术基础

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