国土 こくど開発 かいはつ幹線 かんせん自動 じどう しゃ どうでした
kokudokaihatsukansenjidōsha dōdeshita

Noun
Desu Copula

The polite past form of 国土開発幹線自動車道

1. It was the National Highway Network.; It was a national development highway.

Past/Perfective
Polite