sentences:  The Autodromo had been expanded in 1968 to allow for a circuit and eliminating the use of public highways.World Championship status would return again in 1971 while Formula One would also test the re-addition of the Argentine Grand Prix by holding their own exhibition race.The circuit would be modified again in 1972, shortening the lap to for the sportscars, while the Argentine Grand Prix officially returned to the Formula One calendar where it would stay for nearly a decade.