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 此题答案选E, 但这里but前后不平行，相比之下D答案前后才是平行结构。 but前后到底需要平行么？