souvik101990 wrote:
Rock samples taken from the remains of an asteroid about twice the size of the 6-mile-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.
rock samples......., have. correct match of SV.
dated at - correct idiom
have been dated ...and thus are... parallel
(A)has been dated to be 3.47 billion years old and thus is
(B)has een dated at 3.47 billion years old and thus
(C)have been dated
...
