题目选项分析

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, when combined with her talent for writing, that made her one of the most valuable historians of the era.

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, and this vantage point, combined with her talent for writing, made her one of the most valuable historians of the era.