How it works

来源: dr_yin 于 2015-10-20 07:07:58 [] [旧帖] [给我悄悄话] 阅读数 : (184 bytes)
回答: Mathcounts Training 由 dr_yin 于 2015-10-19 21:10:14
All my students are online students. We use Skype. I have a whiteboard on the wall which is right in the front of my webcam. It works very well.
 
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