prep sc 45题的一个疑问

airphone

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，那个have examined是现在完成时，而determined是一般过去时，怎么能用and并列呢？前后时态不是不一致么？还是说and后面省略了have，但是时态问题能这样省略么？

蓝兰紫籽

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，那个have examined是现在完成时，而determined是一般过去时，怎么能用and并列呢？前后时态不是不一致么？还是说and后面省略了have，但是时态问题能这样省略么？

-- by 会员 airphone (2012/4/6 11:42:04)

E,就像LZ自己分析的那样，它就是省了……

airphone

那，这种省略是必须省还是省不省略都可以？

lysiane

同疑问..我在新东方上课的时候老师说不能这么省略have的