急请教GWD31-28

答案　是E，　

C　中　have been dated 在含义上等于to be , 意义是重复的。

我选C

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

中这种表达合适吗

C

好象有个知识点:现在发现已经过去的事情用to be更好,(og 10th version应该有道题目,believed to be of...)

类似..estimated to be..

讨论

我选E,GWD-13-Q28中关于date有类似的用法date at.

GWD-13-Q28:

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 D

这个在GMAT prep出现了，选C

楼上的肯定吗，PREP选C？

时隔一年终有定论

C

况且很简单的一个问题就是：dated at XXyear可以，但后面还有一个old阿

所以只能是dated to be xx year old