Q1:
Although she had been known as an effective legislator first in the Texas Senate and later in the United States House of Representatives, not until Barbara Jordan’s participation in the hearings on the impeachment of President Richard Nixon in 1974 was she made a nationally recognized figure, as it was televised nationwide.

• later in the United States House of Representatives, not until Barbara Jordan’s participation in the hearings on the impeachment of President Richard Nixon in 1974 was she made a nationally recognized figure, as it was
• 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
• 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
• then also later in the United States House of Representatives, not until 1974 did Barbara Jordan become a nationally recognized figure, as she participated in the hearings on the impeachment of President Richard Nixon, being
• then also 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 was

答案B唯一让我觉得不妥的地方在于which离他修饰的成分hearings这么远，这样可以吗？不是说要严格修饰最近的那个词吗？多谢

which不严格，A of B,which结构里面的which是既可以修饰A也可以修饰B的，只是说大多数时候which会修饰前面的那个B。
因为which引导的是非限制性定语从句，严格的是that，很严格

其实还是喜欢严格的……

you can actually ignoe the words begining with of,
all these words such begin with of, in, at, can be jus ignored, so u got a clearer idea about the sentaces

多谢各位，因为要赶pace，SC我要保证最多花一分钟一道，很多就用技巧了，所以我也喜欢严格的。。。