___________is an open source operating system based on the Linux distribution

English as a Second Language English Vocabulary, Grammar and Idioms
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___________is an open source operating system based on the Linux distribution. (*) MacOS (*) Apple iOS (*) Ubuntu (*) Microsoft Windows

This is a companion discussion topic for the original entry at https://english.best/questions/23087,___is-an-open-source-operating-system-based-on-the-linux-distribution/
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Ubuntu is an open source operating system based on the Linux distribution.

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