请教一道PP语法题

franciscoliu

4. Perhaps the most significant postwar trend was the decentralization of cities throughout the United States, _________ 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

答案B中that accelerated是什么成分？定语从句吗？accelerate不用接宾语？

llliiiuuu

accelerated suburban growth.

franciscoliu

以下是引用llliiiuuu在2005-9-9 23:49:00的发言：

accelerated suburban growth.

suburban growth前的动词是permitted，不是accelerated,when后面是整个一个从句。请再解释解释，我还是不明白

水滴石穿

前面说了一句话,这句话正是a phenomenon 所以偶就一眼选了B.偶对句子成分一向搞不清,帮不了你了.

kangkai100

accelerate不一定带宾语,主动表被动."促进"了phenomenon

merrygoblin

"that accelerated" in this sentence functions as an attributive clause.
"that" refers to "phenomenon", "accelerated" is the predictive.
"accelerate" can be both transive and intransive, thus it may or may
not have an object.