Four of the businesses charged with selling alcoholic beverages to minors have received letters of reprimand, and selectmen will hold hearings on Wednesday for four other businesses that police say sold to minors in a recent operation. According to Town Manager William R. Ross, selectmen on Aug. 14 approved sending the reprimand to Asia Grill & Sushi, Cork’s Fine Wine and Liquors, The Store, and Cibo Matto Café. In addition to the reprimand, their staff members will also have to undergo training and the businesses will be inspected at least twice during the upcoming year. None of those businesses had been found in violation of their licenses in the past three years, Ross said. All businesses in town were warned in advance that a police operation would take place, and Selectman Douglas Annino voted against the reprimand, urging stronger penalties instead. Casey O’Conor’s, one of the businesses to have a hearing on Wednesday, has had its license seized by the Massachusetts Department of Revenue for back taxes, and Ross said he is unsure how the matter will be handled.