Rock samples taken from the remains of an asteroid about twice the size of the 6-mile –wide asteroid 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 _出国考试答疑器_GMAT

Rock samples taken from the remains of an asteroid about twice

the size of the 6-mile –wide asteroid 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 3.47 billion 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

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