题目：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.
我的问题是答案中说划线部分的they指代不清。A group of paleontologists, a site都是单数吧，they要指代不是只能是fossils吗？怎么会指代不清呢？
还有就是recently announced that a site in Utah has，这里为什么用has呢？而不是had啊？
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发表于 2009-8-31 11:15:00
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