11. The aristocratic values expressed in the writings of Marguerie Yourcenar place her within the French classical tradition, as does her passionate interest in history, particularly Roman history.
A. as does
B so do
C. as do
D. so is the case with
E. similarly, does
A是正确答案，我在想为什么D不可以呢
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
Answer is C, why C is wrong
Looking forward to your explanation,thanks beforehand! 
第5题你可以看一下：http://forum.chasedream.com/dispbbs.asp?boardID=23&ID=270756&page=2
11题，我的理解是d选项增加了实意名词：the case。应该不对。白勇的书上都有解释的，他怎么说的，还有是这题是哪章的第几题。
1 twice 是表达数量的，如twice as many/much as, 所以 twice as fast as 这儿已经错了。单纯it was in ，看不出问题。
2 twice还可以加名词或what从句，所以答案是 twice what it was in
上面这个解释挺清楚的，谢谢
我是在CD上下载的某位同学的白勇语法题目，第一题是section7-11,解释只是说A简单明了，就没有其他的了
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