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PLACE steak and combined vegetables in separate resealable plastic bags. Pour 1/4 cup of the marinade over the steak and the remaining marinade over the vegetables. Seal bags; turn to coat. Refrigerate 30 min. to marinate.
PREHEAT grill to medium heat. Remove steak and vegetables from bags; discard marinade.
GRILL steak, uncovered, 17 to 21 min. for medium-rare to medium doneness, adding the vegetables to the grill for the last 5 to 8 min. of the grilling time and cooking until crisp-tender, turning occasionally.