it形式主语和代词~请教了

118.       (30767-!-item-!-188;#058&004308)

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

answer is A

A中是两个强调句的并列，但是前一个强调句中还有一个it指代 The Washington Post ，这样it做形式主语和代词出现在同一句中是可以的吗，求教，谢谢

有眼无珠，语法笔记在这题后面就解释了~~对不起了~~

补充说明：强调结构
强调结构，即“it+be 动词+强调部分+who(m)或that+其他部分”。
强调结构中的it 不作句子结构中的任何成分，无所指代，故认为不与后面有所指的it 冲突。
但形式主语（也叫先行主语）不一样，形式主语it 指代了句子的真正主语（真正的主语在句子后部），
因为有所指，所以句子中如果再出现其它有所指的it，就冲突了。