The Holbrook Board of Selectmen and School Committee met in joint session last Monday for what one selectman said was the first time in at least two years. They discussed the status of the school district’s proposed building project, the $40,000 school regionalization study article that appeared on Wednesday’s Town Meeting warrant, and a mutual desire to hold joint meetings a few times a year. Relations between the boards have been tense at times as Holbrook considers school regionalization while simultaneously seeking state funding to build a school whose grade configuration has yet to be determined. Joel Seeley of Symmes, Maini, & McKee Associates in Cambridge, the town’s project manager for the construction project, reviewed four options: grades 6-12, 7-12, K-12, and K-8. Officials said they believed Holbrook needs to study regionalization to make a plan for where to educate grades 9-12 if the town elects the fourth option. Timothy Gordon, chairman of the selectmen, said the size of the first two options could be appropriate for a future regional school.