求助语法题

renwangbage

. Perhaps the most significant postwar trend was the
  decentralization of cities throughout the United States,
  _________ when massive highway-building programs
  permitted greater suburban growth.

       and accelerated a phenomenon  
       a phenomenon that accelerated  
       accelerating a phenomenon which,  
       the acceleration of which phenomenon
答案是。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。。B
为啥
_________, domesticated grapes grow in clusters,
  range in color from pale green to black, and contain
  sugar in varying quantities.

      Their botanical classification as berries  
      Although their botanical classification as
         berries  
      Because berries being their botanical
         classification  
      Classified botanically as berries

D

[此贴子已经被作者于2003-11-19 7:41:32编辑过]