I got confused with an exercise. I had to fill in the gaps and I instinctively used present perfect in the first gap... then I thought it was a passive sentence and I corrected it but now I ‘m confused... here’s the sentence
wine - is being produced- in Napa valley since the 19th century, but it - has been- only since the 1960s that wine of any particular quality - is being produced-
are the tenses between the dashes correct? Or were they all mere present perfect?