Prep 07 —86题，求解释

听sophie · 发表于 2011-2-11 19:58:02

An international team of astronomers working at telescopes in the Canary Islands and Spain has detected at least 18 huge gas spheres estimated to have 5 to 15 times the mass of Jupiter, thesolar system's largest planet.

(A) astronomers working at telescopes in the Canary Islands and Spain has detected at least 18 huge gas spheres estimated to have 5 to 15 times the mass of Jupiter

(B) astronomers working at telescopes in the Canary Islands and Spain has detected at least 18 huge gas spheres estimated to be 5 to 15 times Jupiter's mass

(C) astronomers is working at telescopes in the Canary Islands and Spain, having detected at least 18 huge gas spheres that are estimated at 5 to 15 times the mass of Jupiter

(D) astronomers, working at telescopes in the Canary Islands and Spain, and has detected at least 18 huge gas spheres estimated at 5 to 15 times the mass of Jupiter

(E) astronomers, working at telescopes in the Canary Islands and Spain, has detected at least 18 huge gas spheres they have estimated to be 5 to 15 times Jupiter's mass

答案是A
我选了B，estimated to be才对
A中的estimated to have 也可以？

求解答~
谢谢~~

hyyyyyy · 发表于 2011-2-11 20:01:30

我怎么记得是estimate to do 这个搭配呢

听sophie · 发表于 2011-2-11 20:10:32

我怎么记得是estimate to do 这个搭配呢

-- by 会员 hyyyyyy (2011/2/11 20:01:30)

我记得关于estimate的用法有两种：
1，be estimated at+多少钱（估价的意思，多少钱）
2，be estimated to be sth.
所以才迷惑~

evelyn205205 · 发表于 2011-2-11 20:32:16

这里最重要的问题是最后几个字“thesolar system's largest planet”，这是修饰什么的？当然是修饰Jupiter的，而不能修饰Jupiter's mass。选B的话把中心词都变掉啦。
estimate to do我不知道可不可以。但在GMAT语法中，是相对正确的。B的estimated to be虽然正确，但是后面逻辑错误是大忌，因此在这道题里，“estimated to have”就算错，也只是犯了个effectiveness的错误。

aeoluseros · 发表于 2011-2-11 20:41:03

be estimated to be/have/cost etc.
be estimated to后面接类似linking verb的动词，即描述状态的动词。

hyyyyyy · 发表于 2011-2-11 20:54:39

首先谢谢斑竹那be estimated 后面可以跟除了to以外的别的介词吗例如at

aeoluseros · 发表于 2011-2-11 21:06:04

嗯，be estimated at + number (price, size, quantity, value, cost, temperature, etc.)
e.g. be estimated at $5,000; be estimated at 5,000
另外，be estimated to be + number也可以
----
be estimated后面介词就用to和at.
----
有时用idiom来判题很头疼

hyyyyyy · 发表于 2011-2-11 21:18:15

确实明明记住了被选项一迷惑就犯晕了

听sophie · 发表于 2011-2-11 21:24:07

确实明明记住了被选项一迷惑就犯晕了

-- by 会员 hyyyyyy (2011/2/11 21:18:15)

经过你们这里的一讨论
我清晰了！
做题的时候总是看pace表，紧张的都不会分析了……

听sophie · 发表于 2011-2-11 21:27:15

嗯，be estimated at + number (price, size, quantity, value, cost, temperature, etc.)
e.g. be estimated at $5,000; be estimated at 5,000
另外，be estimated to be + number也可以
----
be estimated后面介词就用to和at.
----
有时用idiom来判题很头疼

-- by 会员 aeoluseros (2011/2/11 21:06:04)

看来只用idiom来排除是不太可取的……
还是要老老实实分析句子结构的！
要谢谢斑竹了~
estimated的用法清晰起来了~

本贴相关题目 GMATPrep-2007E1-SC-86 (JJYY)

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