A number of high buildings have arisen there was nothing a year ago but ruins. A. whereB.

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(答案→)A. where
B. when
C. before
D. until
解析：考查地点状语从句。状语从句的连接词的选择主要根据句意来判断分析。本题中的where there was nothing a year ago but ruins是地点状语从句，用来修饰前面的主句。句意：很多高楼大厦出现在一年前只有废墟的地方。故A正确。