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BOSTON– All-Star forward Ben Simmons participated in pregame workouts ahead of the Nets’ Game 1 loss to the Celtics on Sunday. Simmons, who has yet to make his debut in Brooklyn after the Feb. 10 James Harden trade because of a lower back injury, looks like he has made significant strides in his mobility, and The Athletic’ s Shams Charania continues to report Simmons...