大全sec20T14一道比较题

5. 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
第二选项twice as fast as it was in, it指代rate of increase，这样的对比关系是存在的。比如说“I am twice as tall as you are.”。既然如此，第二选项为什么不对呢？第三选项中的what 和it 分别指代？
另外，two times faster的中文含义和twice as fast as中文含义是不是不一样啊？two times faster是不是表示比两倍还快？ 而twice as fast as表示两倍？

请nn帮忙分析一下，谢谢

885做了两遍,现在对这种题有点感觉, twice as fast as 和twice as likely as 的错误一样,只能说as tall as 是实义词, 而likely, fast则是抽象词, twice是明确的倍数词,所以不能用twice as fast as,这一点陈向东的语法书有提到

没有见过twice as likely as 这中用法，逻辑意思上也似乎无法成立。但as fast as 肯定是有的。比如: I run as fast as you do.
所以，我需要再次recap 我的问题。谢谢。

第二选项twice as fast as it was in, it指代rate of increase，这样的对比关系是存在的。比如说“I am twice as tall as you are.”。既然如此，第二选项为什么不对呢？第三选项中的what 和it 分别指代？
另外，two times faster的中文含义和twice as fast as中文含义是不是不一样啊？two times faster是不是表示比两倍还快？ 而twice as fast as表示两倍？

我也觉得B是可以成立的.不同时态的比较.各种比较的对应关系也很明白.

请牛牛指点B.C的区别.

为了把这个问题弄清楚，我找到了一个GMAT逻辑上的例子

When a person is under intense psychological stress, his or her cardiovascular response is the same as it is during vigorous physical exercise. Psychological stress, then, must be beneficial for the heart as is vigorous physical exercise.
这里的same as it is during vigorous physical exercise.同twice as fast as it was in the 1970's.用法非常类似。但是答案(C) twice what it was in肯定是有理由的，请大家帮忙继续分析。谢谢。

咳，发现还是前辈们的讨论精彩！大家还是多看以前的讨论吧！

http://forum.chasedream.com/dispbbs.asp?boardID=23&ID=20634

got it. thx.