have been dated at 还是to be呢

barmecider

rock samples have been dated at 10000 years ago还是been dated to be 10000 years ago呢,我看的两份答案都不一样的.请高人指点啊!

keven_chen

此题是一道GWD题,到底该选哪一个呢,个人倾向于to be啊

ballparks

Rock samples have been dated to be 10,000 years ago.
-- Rock samples have analyzed by sceientist to be at least 10,000 old.

Rock samples have been dated at 10,000 years ago
-- This is not possible. First, science was not that fancy 10,000 years ago to be able to know the age of rock sample. Second, even it is the case, you cannot use past participle and you have to change to past tense.

barmecider

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.

此题选这个选项 sloth, found in Puerto Rico in 1991, have been dated at 34 million years old, making the sloth the earliest known mammal on

看来还是应该dated 各位注意了

quanquanwins

to be 吧

zoechow

I see confusion here.

Sth dated at xx years OLD

Sth dated to be  xx years AGO.