[求助]

112.
                (30491-!-item-!-188;#058&004240)

Though certain breeds of dog are renowned for their sense of smell, there is often a greater difference in scenting ability between two members of a single breed as there is between members of different breeds.

(A) is often a greater difference in scenting ability between two members of a single breed as there is

(B) is often more difference in scenting ability between two members of a single breed as to find one

(C) is often a greater difference in scenting ability between two members of a single breed than

(D) are often greater differences in scenting ability between two members of a single breed as there are

(E) are often greater differences in scenting ability between two members of a single breed than there is

答案C 为什么呢？麻烦大家了

A： is often a greater difference in ... as .... 不对 应该是 is  a greater difference in ... than ...
B: is often more difference in scenting ability  should be: there are more different. or is often more differenc in ... 也对，我也说不好，觉得怪怪的。
C: is often a greater difference in scenting ability between two members of a single breed than  (in scenting ability省略)
                between members of different breeds
D are often greater differences in scenting ability between two members of a single breed  as there are should be 'than '
E: are often greater differences in scenting ability between two members of a single breed than there is should be 'than'

拙见，仅供参考。