求教prep1-112

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

答案是C。

请问比较对象是什么？我感觉更像是“difference”，但是按照标准答案来看，似乎是两个between引导的介宾短语。

如果是difference，似乎than后面应该补上there is。。。

谁能帮忙看看？

谢谢

状语比较：

即 同种之间的差别 比不同种之间的差别  更大

比较的主语相同，可以省略

There are more people in classroom A than (there are) in classroom B.

与153. (33147-!-item-!-188;#058&006555)

 相比较

 相比较

A recent United States Census Bureau report shows that there are more than three times as many

households where the children and grandchildren are living in their grandparents' home as

compared to households where the grandparents are living in their children's or grandchildren's

home.

(A) as compared to households where the

(B) as there are households where the

(C) as those whose

(D) than compared to those where the

(E) than there are whose

我觉得是否补足there be问题在于比较的宾语是否在as……as与more than 之间。

如果在之间，那么需要补足宾语，不然比较的内容有些不清晰；如果宾语紧跟在谓语的后面，且在as as与more than 之前，那么可以省略 there be。不会产生歧义。

欢迎拍砖！个人见解，有待考证！

补全是不是：

there
        is often a greater difference in scenting ability between two members of a single breed than (difference in scenting ability)between members of different breeds.