Perhaps the most significant postwar trend was the decentralization of cities throughout the UnitedStates，( )when massive highway-building programs permitted greater suburban growth. A.and accelerated a phenomenon B.a phenomenon that accelerated C.accelerating a phenomenon which D.the acceleration of which phenomenon
Perhaps the most significant postwar trend was the decentralization of cities throughout the UnitedStates，( )when massive highway-building programs permitted greater suburban growth.
A.and accelerated a phenomenon
B.a phenomenon that accelerated
C.accelerating a phenomenon which
D.the acceleration of which phenomenon
B.a phenomenon that accelerated
C.accelerating a phenomenon which
D.the acceleration of which phenomenon
参考解析
解析：考查同位语结构。a phenomenon是the decentralization of cities throughout the United States的同位语。A项中and为连词，后面应该连接一个完整的句子，但缺主语，故错误。C项语序混乱，which后不能接when引导的时间状语从句。D项中of which作介词宾语，后面应该接一个完整的句子，但只有phenomenon 一个主语，句子不完整，因此错误。故本题选B。句意：可能战后最重大的趋势就是美国城市的分散化，当大规模高速公路建设项目促进了郊区的发展时，这种现象就更明显了。
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