2020年GMAT考试语法每日一练
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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.
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