题目选项分析

Although she had been known as an effective legislator first in the Texas Senate and later in the Untied States House of Representatives, it was not until 1974 that Barbara Jordan became a nationally recognized figure, with her participation in the hearings on the impeachment of President Richard Nixon, which was televised nationwide.

Although she had been known as an effective legislator first in the Texas Senate and later in the United States House of Representatives, Barbara Jordan did not become a nationally recognized figure until 1974, when she participated in the hearings on the impeachment of President Richard Nixon, which were televised nationwide.