A group of paleontologists recently announced that a site in Utah has yielded fossils of some of the biggest armored dinosaurs ever found, _____ found in North America.
C. and the fossils are at least 25 million years older than any similar dinosaur types that previously were
D. fossils that are at least 25 million years older than those ofany similar dinosaur type previously
E. fossils at least 25 million years older than similar dinosaur types that were previously
Correct answer is D
C是不是错在previously were (should be were previously)???