28: 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还是E？

我选C