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4. GWD32-Q4 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 3.47billion 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 to be 3.47 billion years old and thus are 4) have been dated as being 3.47 billion years old and thus 5) have been dated at 3.47 billion years old and thus
are
the answer given is e but, what's wrong with c ne? is there any idiom "dated to be" or "dated at"? help please~~  | 
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发表于 2007-11-10 06:46:00
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