None of these mean that.Thanks e2e4
By the way, do all they (previously/ earlier) mean 'in early days/ in early times/ in old times'?
That does not mean "in early times" either. In this noun phrase, "previously" might mean last month or last year."Museums and art galleries which had previously been open to the public."
Yes, that is how I would read it. But as the others have said - without actual context there are other possibilities. I would not swap in "earlier" or "before" because both of them seem less precise than "previously" if we are going to read it as you suggest.By the way, doesn't 'had been open' indicate that 'previously' here means 'in the past'...like- then (after something happened) it was not kept open to the public?
The google search also provides its synonyms as 'formerly', 'in the past' etc.
Could you please help!!