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题库 / Prep2007E2-SC-36
A group of paleontologists recently announced that a site in Utah has yielded fossils of some of the biggest armored dinosaurs ever found, and that they were at least 25 million years older than any similar dinosaur type previously found in North America.
and that they were at least 25 million years older than any similar dinosaur type previously
and they are at least 25 million years older than those of any similar dinosaur type that previously was
and the fossils are at least 25 million years older than any similar dinosaur types that previously were
fossils that are at least 25 million years older than those of any similar dinosaur type previously
fossils at least 25 million years older than similar dinosaur types previously
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DC区分：
AB的they指代有可能是paleontologists fossils 或者 biggest armored dinosaurs
这里those of any similar dinosaur type和similar dinosaur types区，区别是不是一个对比是这种类型的fossil一种知识types, thoes指代fossils， 同类指代
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