求助一道OG有关过去完成时

mayarie

65. Digging in sediments in northern China, evidence has been gathered by scientists suggesting that complex life-forms emerged much earlier than they had previously thought.

(A) evidence has been gathered by scientists suggesting that complex life-forms emerged much earlier than they had
(B) evidence gathered by scientists suggests a much earlier emergence of complex life-forms than had been
(C) scientists have gathered evidence suggesting that complex life-forms emerged much earlier than
(D) scientists have gathered evidence that suggests a much earlier emergence of complex life-forms than that which was
(E) scientists have gathered evidence which suggests a much earlier emergence of complex life-forms than that

答案是C，想问一下A里的had是否有错呢？好像没有看到这一点的解释.....

DUKB24

首先应该是had been thought
再来，考虑timeframe
had been thought（这里应该是指科学家或者研究人员）

那合乎逻辑的应该是complex life forms 先emerged （原选项是simple past），这个现象出现了之后才可以开始被研究和被thought吧（所以这里用过去完成时不合理）

mayarie

DUKB24 发表于 2014-6-16 16:42
首先应该是had been thought
再来，考虑timeframe
had been thought（这里应该是指科学家或者研究人员）

哦哦非常感谢~~~