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マルチタスクオペレーティングシステムでした
maruchitasukuoperētingushisutemudeshita

敬
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Noun
, 
Desu Copula

The polite past form of マルチタスクオペレーティングシステム

1. Was a multitasking operating system.

Past/Perfective
, 
Polite
, 
Computing

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