I would prefer to use the prepositions "over" or "during". Also, don't combine "these" with "past three". "These" refers to some time period mentioned earlier.
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I would prefer to use the prepositions "over" or "during". Also, don't combine "these" with "past three". "These" refers to some time period mentioned earlier. For example:
The years between 1990 and 1993 were quite revolutionary. In (or during / over) these three years,....
The first weeks in February were especially difficult. During these three weeks, we had a lot of pr