The development of Bas 90 began in the 1970s and was implemented in the 1980s .
The development of Bas 90 began in the 1970s and started being implemented in the 1980s .
The development of Bas 90 began in the 1970s and started being implemented in the 1980s .
このテキストを言い換えてください: The development of Bas 90 began in the 1970s and was implemented in the 1980s . 出力: