Prep SC1 118 关于IT用法求教

118.

It was only after Katharine Graham became publisher of The Washington Post in 1963 that it moved into the first rank of American newspapers, and it was under her command that the paper won high praise for its unrelenting reporting of the Watergate scandal.
(A) It was only after Katharine Graham became publisher of The Washington Post in 1963 that it moved into the first rank of American newspapers, and it was under her command that the paper won high praise

(B) It was only after Katharine Graham's becoming publisher of The Washington Post in 1963 that it moved into the first rank of American newspapers, and under her command it had won high praise
    

(C) Katharine Graham became publisher of The Washington Post in 1963, and only after that did it move into the first rank of American newspapers, having won high praise under her command 

(D) Moving into the first rank of American newspapers only after Katharine Graham became its publisher in 1963, The Washington Post, winning high praise under her command

(E) Moving into the first rank of American newspapers only after Katharine Graham's becoming its publisher in 1963, The Washington Post won high praise under her command

答案是A
我的问题如下：

根据语法规则：若前句用的是所有格形式，后句的代词若想指代前句的所有者，是绝对错的。

that it moved into的it指的是The Washington Post，而The Washington Post不就是所有格里面的所有者吗？

谢谢。

什么东西的绝对错误？GMAT中似乎罕有绝对错误的东西，可以参考前人讨论的帖子http://forum.chasedream.com/dispbbs.asp?boardid=23&replyid=105288&id=15311&page=1&skin=0&Star=3