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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.
  1. Has been dated to be 3.47 billion years old and
    thus is
  2. Has been dated at 3.47 billion years old and thus
  3. Have been dated as being 3.47 billion years old
    and thus
  4. Have been dated to be 3.47 billion years old and
    thus are
  5. Have been dated at 3.47 billion years old and
    thus are

A
Have been dated as being 3.47 billion years old
and thus
B
Has been dated to be 3.47 billion years old and
thus is
C
Have been dated to be 3.47 billion years old and
thus are
D
Has been dated at 3.47 billion years old and thus
E
Have been dated at 3.47 billion years old and
thus are
Solution
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thus are

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