In a medium skillet over medium heat, heat olive oil and butter. Add tomatoes, parsley, and garlic; simmer and let reduce, about 5 minutes. Add some clam juice if the sauce reduces too much.
Meanwhile, bring a large pot of lightly salted water to a boil. Add pasta and cook for 3 minutes or until al dente; drain.
Add pasta and clams to the skillet and heat through; top with Parmesan cheese and serve immediately.
