PREP SC一题两解，求高手指点

zydiana

PREP SC中一道语法改错题，做到2次，但是答案不一样，哪位高手指点一下。

129.      (31370-!-item-!-188;#058&004475)

 

In addition to her work on the Miocene hominid fossil record, Mary Leakey contributed to archaeology through her discovery of the earliest direct evidence of hominid activity and through her painstaking documentation of East African cave paintings.

 

(A) Mary Leakey contributed to archaeology through her discovery of the earliest direct evidence of hominid activity and through her painstaking documentation of

(B) Mary Leakey contributed to archaeology by her discovery of the earliest direct evidence of hominid activity and painstakingly documenting

(C) Mary Leakey was a contributor to archaeology by discovering the earliest direct evidence of hominid activity and with her painstaking documentation of

(D) Mary Leakey's contributions to archaeology include her discovery of the earliest direct evidence of hominid activity and painstakingly documenting

(E) Mary Leakey's contributions to archaeology include her discovering the earliest direct evidence of hominid activity and painstaking documentation of

我第一次作选d, 答案也是d, 第二次作的时候，答案为a。 我认为，主语应该是Mary Leakey's contributions,和前面的her work相对应。

Again

你做两次是因为两道很相似的题，仔细对比一下文件就知道。
这道题选A. in addtion to sth,不需要和主语对应。