[求教] 一道用法题谢谢~~

红叶夕歌 · 发表于 2012-3-14 10:06:07

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
(D) to be 40 to 44 million years old provide evidence of
应该选哪个？为什么？谢谢~~~

倩猫记 · 发表于 2012-3-14 12:05:46

选D。estimated TO be在OG的解释中是固定搭配

[求教] 一道用法题谢谢~~

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