Because she knew many of the leaders of colonial America and the American Revolution personally, Mercy Otis Warren was continually at or near the center of political events from 1765 to 1789, a vantage point combining with her talent for writing to make her one of the most valuable historians of the era.
(A) a vantage point combining with her talent for writing to make
(B) a vantage point, when combined with her talent for writing, that made
(C) a vantage point that combined with her talent for writing, and it made
(D) and this vantage point, which combined with her talent for writing to make
(E) and this vantage point, combined with her talent for writing, made
这道题目的答案是E，我想问一下this的出现应该代表的是以前出现过的事物啊，可是这里的vantage point是一个同位语，总结前面的部分并没有出现过怎么还对呢？谢谢大家。 | 
