By Howard Ulman BOSTON - Kevin Garnett gives Boston a new Big Three that brings the Celtics much closer to what their old Big Three delivered - an NBA title. The Celtics, who have 16 championships but have gone without one for more than two decades, obtained the former MVP and 10-time All-Star on Tuesday in a 7-for-1 deal - the NBA's biggest trade for one player. Boston sent the Minnesota Timberwolves forwards Al Jefferson, Ryan Gomes and Gerald Green, guard Sebastian Telfair and center Theo Ratliff, two first-round draft picks and cash considerations.