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题库 / Prep2008E2-SC-215
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.
has been dated to be 3.47 billion years old and thus is
has been dated at 3.47 billion years old and thus
have been dated to be 3.47 billion years old and thus are
have been dated as being 3.47 billion years old and thus
have been dated at 3.47 billion years old and thus are
题目分析：
本题中我们可以发现平行制造者and，其所连接的内容需要在逻辑上和语形上均保持一致。
选项分析：
A选项：由于date的主语是复数（rock samples），所以应改为have been dated（and身后的be动词同理）。
另外，be dated to be是错误的，只能用be dated to或be dated at。看起来是在考查语法，实则不然，这背后是在考查考生的逻辑推理能力。将date换为主动语态则有：
X dated samples to be 3.47 billion years old.
借用不定式和名词的区别可知，我们需要根据谓语动词date的约束力来判断宾语的补足语是否应该用不定式的形式。显然地，样本是否是3.47bilion这么大年岁，和人类是否追溯这个样本约束关系（你是否勘查这个样本，人家样本都是那么大岁数。当然，如果是你蓄意的编造这个样本的年龄，那就是另外一个故事了）。因此，不能用不定式短语to be 3.47 billion years old。
B选项：并列连词and必须连接两个句子，后半句缺少谓语动词。
C选项：be dated to be错误同(A)。
D选项：and连接两者错误同(B)。
E选项：Correct. 本选项在语法和逻辑上均是正确的。
1.主谓一致，AB错
2.idiom:CD错
Date的固定搭配：date to 后面是ago，且to后面直接接年代数字（不需要接be）；date at 后面与old搭配
3.句子结构，and后面应该有are，ABD错。
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