[求助]GWD-31-Q28 答案到底是甚么啊

andylouis

（1）     GWD-31-Q28?????????

Rock samples taken from the remains of an asteroid about twice the size of the 6-nuke-wide asteroid that eradicated the dinosaurs has been dated to be 3.47 billion years old and thus is evidence of the earliest known asteroid impact on Earth.

A: has been dated to be 3.47 billion years old and thus is

B: has been dated at 3.47 billion years old and thus

C: have been dated to be 3.47billion years old and thus are

D: have been dated as being 3.47 billion years old and thus

E: have been dated at 3.47 billion years old and thus are

 

C the best 

 看讨论 到底是C 还是E啊    

 为甚么thus are  前面不是have been 吗？？？？？ 

andylouis

ding

kenzopeace

E

可參考GWD-8-34
Fossils of the arm of a sloth, found in Puerto Rico in 1991, have been dated at 34 million years old, making the sloth the earliest known mammal on the Greater Antilles islands.

kevintown

结构： the remains of X have been dated at... and thus are evidence of....

C和E语法上讲都是对的，只能说ETS更喜欢E的用法，而且确实E 中，
                dated at n years old
                是更常见的用法。Nytimes上无数

也是GWD的题：Fossils of the arm of a sloth found in Puerto Rico in 1991, and dated at 34 million years old, made it the earliest known mammal of the Greater Antilles islands.
            

 

虽然也能找到2，3个dated to be的例子，但是的确比较少用

http://www.nytimes.com/2007/12/09/world/europe/09cave.html?ref=todayspaper&pagewanted=all

But its images, dated to be 30000 years old, and its floor, dotted with ancient footprints of people and animals, have been open only to researchers and

An episode this season also revealed that a crashed alien spaceship, carbon-dated to be millions of years old, was encrypted with passages from the world's

kevintown

正规常用的是 date back to, date from, date at

georgetseng

应用dated at xxx years old， 或dated to xxx years ago； 因此选E)。

理由如下：

A)google一下“dated at" + old, 1.18Million 条记录； google "dated to be" + old, 仅80K条记录。

B)字典里找不到dated at 或 dated to be的说明，没有权威解释，因此我们只能依靠GMAT官方原题中的用法来寻找权威依据： 在GWD中见过至少2次dated at xxx years old和1次 dated to xxx years ago的用法，但没见过dated to be xxx years old的用法。
如：
1) 逻辑题GWD-11-Q41: Another campsite
was found in New Mexico
with remains dated at 16,000 years old
2） GWD-8-Q34所以选项均为dated at的用法
Fossils of the arm of a sloth found in Puerto Rico in 1991, and dated at 34 million years old, made it the earliest known mammal of the Greater Antilles islands.
a.sloth found in Puerto Rico in 1991, and dated at 34 million years old, made it the earliest known mammal of
b.sloth, that they found in Puerto Rico in 1991, has been dated at 34 million years old, thus making it the earliest mammal known on
c.sloth that was found in Puerto Rico in 1991, was dated at 34 million years old, making this the earliest known mammal of
d.sloth, found in Puerto Rico in 1991, have been dated at 34 million years old, making the sloth the earliest known mammal on
e.sloth which, found in Puerto Rico in 1991, was dated at 34 million years old, made the sloth the earliest known mammal of

另外，可以用dated to xxx years ago， 如下题 T-4-Q1：
 Scientists have dated sharp-edged flakes of stone found in the fine-grained sediments of a dry riverbed in the Afar region of Ethiopia to between 2.52 and 2.60 million years ago, pushing back by more than 150,000 years the earliest date when it is known that humans made stone tools.
a. when it is known that humans made
b. at which it is known that humans had made
c. at which humans are known to have made
d. that humans are known to be making
d. of humans who were known to make

另外，顺便总结一下，在GMAT题中还可以找到dates back xxx years （但没有dates back xxx years ago), dates to xxx years ago, dates from xxx years ago的用法。

hellowin

楼上的太强了。。。

whismanc

?

yy179920478

up

yanglinsheep

well done...