定语从句填空after the war,a new building was put up-there had once

where
先看现行词a new building 是地点,初步确定是where,再看后面there had once been a theater这个分句的基本成份都全,所以肯定是where.填完后,再翻译一下整句话."在那场战争之后,原先的剧院盖成了大楼"