[問題]JJ-2004-09

[studentC]

這是一道從CD抄下來的2004-09-JJ題

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.

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

請問答案是 C or E?
此題應該是在問dated to be xxx years.. or dated at xxx years..
我查google, 兩者都有人在用.
我再查Longman:
dated: VT. -- to guess or decide the date of.
example: The archaeologists have dated the building to about 250 B.C.

somebody have any idea?