1. The efforts of the bipartisan committee were marked as much by frustration as it was by success.

(A) as it was by

(B) and also by

(C) as by

(D) and equally by（C）

(E) as there was

请问如果把C补全了是不是这样:

The efforts of the bipartisan committee were marked as much by frustration as the efforts of the bipartisan committee were marked by success.

如果把A改成: as the efforts were by对不对呢?这里省略的原则是什么啊?

（C) as by（those were marked ） by success

根据as。。。as排除BD

A，it 和前面得efforts were marked不符合

E。变成了there be结构，改变了by得意思，随意删减了by

C，是by frustration （those were marked by）by success

The efforts of the bipartisan committee were marked as much by frustration as it was by success.

虽然LZ提出把A改成as the efforts were by，语法没有问题，但是仍然不是最佳答案。既然要省略，那么两个as的结构应尽量相似和简洁。前一个by，后面直接跟frustration,则根据parrelism，后一个也应该紧跟一个名词。

many thanks !!!!