OG11-21题请教

上官

21.   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

答案是D，用estimated的用法就选出来了，但是有一个问题没弄懂，OG上解释说provide和fragments 主谓一致，但是我没有看懂这句话的结构。

Paleontologists believe that  fragments （of a primate jawbone  ) unearthed and estimated (to be 40 to 44 million years old )provide……

因为有and 连接，所以  unearthed 和estimated并列，那provide在这儿又是什么意思呢，为什么是fragments的谓语呢，看不懂结构了。本人语法白痴，问了个很笨的问题，恳请教NN们指教

ARCHER420

非牛看法。

全局骨架 plaeotoolgists believe that fragments provide evidence.

provide是提供的意思。of a primate ....years old都是修饰fragments的，unearthed...years old都是修饰jawbone的。

of a crucial....human beings都是修饰evidence的。

另外，你说的estimated用法是指estimate to be sth吗？

上官

谢楼上的~~~~~~~~~

也就说是 fragments provide

         jawbone unearthed and estimated …        明白了

我说的estimated的用法是指estimate to be

再次感谢

lesley0927

上官 发表于 2009-10-31 17:16
21.   Paleontologists believe that fragments of a primate jawbone unearthed in Burma& ...

请问为什么不能用estimate at ?

Hliujing

lesley0927 发表于 2013-6-1 06:57
请问为什么不能用estimate at ?

estimate at 接地点或价格   其他好像都是 estimated to be
但是 date 却相反，  date at 是接 .....old    date to be 是接.....ago