og 14

mjiirggh

Paleontologists believe that fragments of a primate jawbone unearthed in Burma and estimated at 40 to 44 million years old provide evidence of a crucial step along the evolutionary path that led to human beings.
(A) at 40 to 44 million years old provide evidence of
(B) as being 40 to 44 million years old provides evidence of
(C) that it is 40 to 44 million years old provides evidence of what was
(D) to be 40 to 44 million years old provide evidence of
(E) as 40 to 44 million years old provides evidence of what was
看了OG的解释，我虽然不觉得A很好，可是这里为什么用estimated to be，我记得TO BE有表示将要发生的意思！请帮忙！谢谢！

liuliyun

to be 可以表示一种“模糊”的感觉，所以前面是用的动词大多数都是estimated，anticipated，thought and etc。