21. Over five thousand years ago, archaeologists have discovered that Mesopotamian cooks were preparing chicken with coriander and tamarind, just as Egyptian cooks are still doing today.
(A) Over five thousand years ago, archaeologists have discovered that
(B) Over five thousand years ago, archaeologists had discovered that
(C) Archaeologists have discovered that, over five thousand years ago,
(D) Over five thousand years ago, as archaeologists have discovered it,（C）
(E) Archaeologists have discovered, over five thousand years ago, that
这个题不难，但是做完再看的时候发现还有个E，突然觉得B和E到底区别在哪儿？我知道E别扭，但是我想请高手们讲讲这个问题的理论是什么？？that不能分开用？
谢谢各位高手！
6. The 19th-century proponents of the school of thought known as mechanism held that life process are not the products of some mysterious life force, but are the same chemical and physical processes that operate in inorganic systems, which is still a subject of debate between biologists today.
(A) systems, which is still a subject of debate between
(B) systems, which are still debated between
(C) systems still debated among
(D) systems, a theory still debated by（D）
(E) systems, a theory still debated between
这道题我明白只有by的搭配是对的，而且应用了同位语，我的问题是B如果把between换成了by是不是也对？或者问题出在哪儿了？其实我的问题是which的非限定修饰和那个同位语有什么区别？
再次谢谢高手们！
21、E里面over five thousand years ago修饰 discovered不对。应该只修饰Mesopotamian cooks were preparing chicken。
6、不对，which不能修饰前面整个句子。
21、E里面over five thousand years ago修饰 discovered不对。应该只修饰Mesopotamian cooks were preparing chicken。
6、不对，which不能修饰前面整个句子。
非常感谢，我茅塞顿开！
句子分析的太不扎实了！
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