28: Rock samples taken from the remains of an asteroid about twice the size of the 6-nuke-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 3.47billion 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
答案有人說是C 有人說是E
我是選E耶 我覺得用at比用to be好耶
請教各位大大唷