GWD31-Q28, 好心人帮忙看个争论题！

GWD31-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,感觉dated at 比较怪。

I think E.

support E........

答案绝对是C，白勇那个语法书有说

只不过我忘了这道题在哪里了。。。

不能说date at...years old...