1.        Before the Civil War, Harriet Tubman, herself an escaped slave, returned again and again to Maryland to guide other slaves along the Underground Railroad to freedom.

(A) herself an escaped slave, returned again and again to Maryland to guide

(B) being an escaped slave herself, returned again and again to Maryland so as to guide

(C) an escaped slave herself, returned again and again to Maryland for guiding

(D) herself as an escaped slave, returned again and again to Maryland so as to be the guide of（A）

(E) who had been herself as an escaped slave, returned again and again to Maryland for the guiding of

答案是A

我不明白C为什么不对，反身代词herself用在同位语首总感觉怪怪的，不如C中放在后面来得通顺

有谁能解释一下吗？谢啦～

to guide 表示目的，for guiding不符合习惯用法吧，所以排除C

不知解释对不对，呼唤大N