[問題]OG 14

[revival]

14.Paleontologists believe that fragments of a primate jawbone unearthed in Burma and estimated at 40 to 44 milion years old provide evidence of a crucial step along the evolutionary path that led to human beings.
(A)at 40 to 44 milion years old provide evidence of
(B)as being 40 to 44 milion years old provides evidence of
(C)that it is 40 to 44 milion years old provide evidence of what was
(D)to be 40 to 44 milion years old provide evidence of
(E)as 40 to 44 milion years old provides evidence of what was

answer D

想請問A為什麼不對呢 ？estimate 後面不是也有可以接at的用法嗎 ？為什麼D來的比A好呢 ？ 謝謝各位大大的回答^^

[wingff]

因為

estimate +N to be N/adj.

estimate+N at N

有錯請指正:)

[brokenenglish]

Longman:
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.

這裡看起來適用第一個情形. the fragments were estimted to be...

[hsudk]

根據CD上牛人的經驗，GMAT 考 estimate 有個小訣竅：
GMAT 不考 estimate "at"；GMAT 中選項出現 "estimate at" 一定錯，永遠選 estimate to V.../estimate that...

[chiaowin]

我看不懂..為什麼 provide 的subject 是 fragments?
請幫幫忙!!

[keane0727]

我看不懂..為什麼 provide 的subject 是 fragments?
請幫幫忙!!

that fragments of a primate jawbone unearthed in Burma and estimated to be 40 to 44 milion years old provide evidence of

of a primate jawbone是of引導的分詞形容詞片語修飾fragments
unearthed.....and estimated to be....old是and連接二個平行的分詞片語修飾jawbone

複數形動詞provide與複數名詞fragments-->主動一致

清楚了嗎？