[求助]求教几题语法题，小弟感激不尽！

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777.The man was always aware, sometimes proudly and sometimes resentfully, that he was a small-town Midwesterner who was thrust into a world that was dominated by wealthier, better-educated, and more polished people than him.
(A) who was thrust into a world that was dominated by wealthier, better-educated, and more polished people than him
(B) who had been thrust into a world that was dominated by more wealthy, educated, and polished people than him
(C) who had been thrust into a world dominated by wealthier, better-educated, and people more polished than he was
(D) thrust into a world dominated by more wealthy, educated, and polished people than him
(E) thrust into a world dominated by wealthier, better-educated, and more polished people than he

答案是E。请问怎么理解？我不明白的是1：结尾为什么是he而不是him。2：省略who was而直接接thrust有什么讲究？在其他情况下是否也可以适用。

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404.In the 1980’s the rate of increase of the minority population of the United States was nearly
        twice as fast as
        the 1970’s.
(A) twice as fast as
(B) twice as fast as it was in
(C) twice what it was in
(D) two times faster than that of
(E) two times greater than
the key: C

怎么理解？B为什么不对？C的表达还有什么情况可以用。

thanks!

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