Heat oil in large skillet over medium heat. Add onion; cook until soft, about 3 minutes. Stir in garlic; cook about 30 seconds. Add tomatoes, basil, salt and pepper; bring to boiling. Reduce heat; simmer 20 minutes.
Meanwhile, cook pasta according to package directions.
Gently stir shrimp into tomato sauce; cook 2 to 3 minutes more, or until shrimp are pink.
Drain pasta; transfer to serving bowl. Top with shrimp marinara. Garnish with parsley, if desired.
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