27. aleontologists 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
对于C的解释OG是这么说的：Introducing a clause, that it is … , creates an
ungrammatical sentence
我去查了下朗曼。Estimate的用法有下面的：（1）be estimated to be/have/cost etc
The tree is estimated to be at least 700 years old.
（2）estimate something at something Organizers estimated the crowd at 50,000.
（3）estimate that Scientists estimate that smoking reduces life expectancy by around 12 years on average.
（4）estimate how many/what etc It is not easy to estimate how many people have the disease.
—estimated adjective: heroin with an estimated street value of £50,000
—estimator noun [countable]
哪里ungrammatical了啊？不是可以跟clause的么？PS：E选项中what was 有啥问题？
estimate的固定用法： estimate (that) （不需加原V） estimate + N + to be N(adj) estimate + N + at + 价格等数量词 （估价）（除此概念以外优先用estimated to be表达） 如：40 to 44 million years是时间概念，要用estimated to be 40 to 44 million years old.
suri总结得真好，我来补充下，Ron大神说过这个idiom的问题 表示某个历史时间的搭配： estimated to be OG12 #27 dated at OG12 #140 不能混淆。GMAT对此要求得很死。
不过以下出现在正确句子中，所以是acceptable的： "estimated at minus 230 degrees Farenheit"
estimate的固定用法： estimate (that) （不需加原V） estimate + N + to be N(adj) estimate + N + at + 价格等数量词 （估价）（除此概念以外优先用estimated to be表达） 如：40 to 44 million years是时间概念，要用estimated to be 40 to 44 million years old.
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发表于 2012-3-2 15:19:54
aleontologists 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.
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发表于 2012-3-3 11:42:36
