求助：prep 07 SC1 的一道语法

stacyfeng

161.(33613-!-item-!-188;#058&007011)

Unlike the other major planets, Plutohas a highly eccentric orbit, which is thus closer to the Sun

than Neptune is for 20 years out ofevery 230-year cycle, even though it is commonly described as

the remotest planet in the solarsystem.

(A) Pluto has a highly eccentricorbit, which is thus closer to the Sun than Neptune is

(B) Pluto has a highly eccentricorbit and is thus closer to the Sun than Neptune is

(C) Pluto's orbit is highly eccentricand is thus closer to the Sun than Neptune

                (D) the orbit of Pluto is highlyeccentric and thus closer to the Sun than Neptune

(E) the orbit of Pluto is highlyeccentric, thus closer to the Sun than Neptune is

答案是 B， 我的疑问在于 B中Neptune 后的 is， 其所修饰的主语是什么？

句子结构如果是： Pluto has.... and is...than Neptune, is 岂不是多余的动词，总觉得这道题没正确选项，请大家帮忙。谢谢。

bejamin1111

P  is thus closer to the Sun than Neptune is.这是比较结构，前后比较的是主语，必须加上is，要不然就会造成sun和N比较的歧义

billkp

觉得是比较结构助动词习惯补出

stacyfeng

bejamin1111 发表于 2013-5-29 11:48
P  is thus closer to the Sun than Neptune is.这是比较结构，前后比较的是主语，必须加上is，要不然就会 ...

谢谢解释，顿悟！