prep1-45

45.   The application of a new method for analyzing the chemistry of tooth enamel allows scientists to examine molars of prehuman ancestors and determining that their diets were more varied than had been supposed.

(A) The application of a new method for analyzing the chemistry of tooth enamel allows scientists to examine molars of prehuman ancestors and determining

(B) Through the application of a new method for analyzing the chemistry of tooth enamel, the molars of prehuman ancestors were examined by scientists who determined

(C) When they applied a new method for analyzing the chemistry of tooth enamel, scientists examined molars of prehuman ancestors, determining

(D) Applying a new method for analyzing the chemistry of tooth enamel, the molars of prehuman ancestors have been examined by scientists, who determined

(E) Applying a new method for analyzing the chemistry of tooth enamel, scientists have examined molars of prehuman ancestors and determined

答案选E，可是我想问，原文未画线的部分，明明是过去时和过去完成时呀，可E中出现的是现在完成时，也许我对这个时态有点搞不清楚，这样也行吗？C为是什么不行呢？

C中有they their的指代不一致的问题

我还是觉得，若按未画线的走，全文应该用过去时呀~~

时态的错误，应该比逻辑的意思更严重吧，而且C的逻辑也不是特别明显的有什么不对呀~~

open to discuss~~

AlienX 说的没错when是个很大的问题，强加了关系

另外，既然主句和分句的主语相同，完全可以用也应该用分词的形式表达，不然多罗嗦啊

最后determine和examine是并列更好一些