Perhaps the most significant postwar trend was the decentralization of cities throughout the United States, ______ when massive

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

选项 A、and accelerated a phenomenon
B、a phenomenon that accelerated
C、accelerating a phenomenon which
D、the acceleration of which phenomenon

答案B

解析 句意:可能战后最重要的趋势就是美国城市的分散化,当大规模的高速公路建设项目让郊区获得更大发展时,便加速了城市分散化这一现象。本题考查同位语结构。aphenomenon是the decentralization of cities throughout the United States的同位语。when引导时间状语从句。因此B项正确,that accelerated定语从句,修饰the phenomenon。A项中and后面的内容与前半句无法构成并列关系,因此A项错误;C项中which后面缺少定语从句;D中phenomenon为多余成分,且of which后缺少定语从句.
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