标题: [求教] 一道用法题谢谢~~ [打印本页] 作者: 红叶夕歌 时间: 2012-3-14 10:06 标题: [求教] 一道用法题谢谢~~ 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~~~作者: 倩猫记 时间: 2012-3-14 12:05
选D。estimated TO be在OG的解释中是固定搭配