prep-sc-45, 求教

45.   (26929-!-item-!-188;#058&003015)

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

答案是E,

想不通为什么要用现在完成式

另C有什么不好?

还是不明白,求教了!

同意楼上的,还有一点就是C中的when用的不对,改变了原来的意思,变成了:当应用...的时候,科学家....

中文好象没啥差别,用英文理解就差远了.GMAT里经常用when从句作为错误选项来混淆视听.按意思应该是,科学家应用....的方法,examine 和determine 了....

同意3楼的,时态不作为首先排除的标准.