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You can use CPT, interactive books in the Oxford Bookshelf by ONLINE or OFFLINE
Offline
Download the app:
Windows:https://drive.google.com/file/d/1nbvIFApqFFey8lyfaP_N-jmEA57yl-4w/view
MacOS: https://drive.google.com/file/d/1KiqC5gZInsVdhXelyuG7y_SucZeNbDZN/view
IPad: Download app on the AppStore
Online:
Use on Website: https://www.oxfordlearnersbookshelf.com/
We can syncs notes between IPad and PC. Note on IPad and it will appear on PC!
If you delete a book in oxford bookshelf app, it will just free up the space on the PC or IPad, when you need it, download it again. It will forever in your account