一道prep语法题，指代问题，求NN解释~

半阙

Prep36、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.

(A) and that they were at least 25 million years older than any similar dinosaur type previously

(B) and they are at least 25 million years older than those of any similar dinosaur type that

previously was

(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 of any similar dinosaur type previously

(E) fossils at least 25 million years older than similar dinosaur types previously

答案选D，A哪里错了呢？答案说they指代不清楚，而且fossils than types 比较对象不对等，我觉得也可以这样理解啊：they就近指代dinosaurs，然后就是dinosaurs 与dinosaurs对比，

azhongzhong

They 、it等代词不能就近指代，只有which ,that 等词才能就近指代。所以A错了。