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COOK pasta as directed on package, omitting salt.
MEANWHILE, cook sausage in large nonstick skillet on medium-high heat 10 min. or until done, stirring occasionally. Drain sausage; return to skillet. Add tomatoes, onions and dressing; cook 5 min. or until onions are crisp-tender, stirring occasionally.
DRAIN pasta. Toss with sausage mixture and 1/2 cup cheese; sprinkle with remaining cheese.