在线课程
Free Discussion

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课程描述 :
As the title suggests, a FREE discussion is an exchange of information about a topic which is chosen by the unanimous agreement of those involved in the discussion.
语言 : 英語
分类 : Duo或集团类
CECR : A1A2B1B2C1C2
持续时间 : 30 分钟
课程 : 在线对话
私人课程质量经济无需移动