旧prep1-52

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

(A) Leakey contributed to archaeology with her discovery of the earliest direct evidence of hominid activity and painstakingly documenting  平行，

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

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

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

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

D

想问一下如果在B里 结构都平行的 话，那么 到底加不加  by 呢？？？？不是说平行的时候不能省略介词吗？？？

我刚刚做了ｐｒｅｐ　答案是A~