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30. 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
(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
GMAT语法改错精讲:
(A)at 40 to 44 million years old provide evidence of
【错误】 固定搭配:“be estimated at”无此搭配。
(B)as being 40 to 44 million years old provides evidence of
【错误1】 固定搭配:“be estimated as being”无此搭配。
【错误2】 主谓一致:“provides”的主语的核心词是“fragments”主谓不一致。
(C)that it is 40 to 44 million years old provides evidence of what was
【错误1】 主谓一致:见(B)中(2)。
【错误2】 固定搭配:不存在“estimated(被动)that……”的用法,因为语法上“that”引导的名词性从句做不了“estimated”的宾语,因为“estimated”是被动形式。
(D)to be 40 to 44 million years old provide evidence of
【正确】 “fragments”和“provide”正确地满足了主谓一致,“estimated to be”是正确的固定搭配。
(E)as 40 to 44 million years old provides evidence
【错误】 主谓一致:见(B)中【错误2】。
【最优解题思路推荐】
“provides”和“fragments”主谓不一致,立即排除(B)、(C)和(E)。即使不确定(A)选项“be estimated at”是否正确,也可以确定“be estimated to be”必然没有错误,因此选择(D)。
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(编辑:马荟)