[求助]由P1-112想开去，抛砖引玉

P1-112

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

答案选C，做题的时候虽然可以通过排除法得到C答案，但对笔记解释：对于C选项，为两个介词词组的比较。

这里为什么是两个介词词组的比较？遇到比较题怎么去判断比较的两个对象是什么呢？

诚心请教各位NN

答案选C，做题的时候虽然可以通过排除法得到C答案，但对笔记解释：对于C选项，为两个介词词组的比较。

这里为什么是两个介词词组的比较？遇到比较题怎么去判断比较的两个对象是什么呢？

诚心请教各位NN