求问preptest2的29题。

Kateez

Unlike many United States cities, where a river is no longer the focal point of urban life, the river in San Antonio winds through the middle of the business district, and the River Walk, or Paseo del Rio, is the city's most popular attraction.


(A) Unlike many United States cities, where a river is no longer the focal point of urban life, the river in San Antonio
(B) Unlike the river in many cities in the United States, which is no longer the focal point of urban life, in San Antonio the river
(C) Today the river in many cities in the United States is no longer the focal point of urban life, unlike San Antonio, where it
(D) In few United States cities today, a river is the focal point of urban life, but the river in San Antonio
(E) No longer do many cities in the United States have a river as the focal point of urban life, but in San Antonio the river
这道题被我列为经常逻辑思维出现的世纪难题－－我经常犯的错误，就是B和E之间的区别，我觉得B中意思也很明确，而且形式平行，E的话句意也是通唱的，我当时用的方法排除E是因为but后面的对象跟前面不对应，但是语法笔记有说but后面可以不对称的握～～是这样子吗？而且虽然说B中which可能指代不清，但从句意上理解我就直接将其代如river了。求问下往往有这种题就是形式平行但是我读的句意也通顺，而另外一种句意顺但是我不决定结构平行，我该如何去平衡～～谢谢～～

DUKB24

in official problems

1.in any correct choices in official examples with the structure like this: unlike N1,  s v o    


you should notice that S( what is being compared) is not preceded by any words or phrases


2. also, which cannot modify rivers


I have never seen in such structure " noun+prep1 + prep2 "    ,which can refer to noun !


if you have any counter-example, please further post it


I'm pretty sure about #1