试题题干
With an appropriate relative pronoun or relative adverb:
This custom,
originated many centuries ago, is slowly disappearing.
参考答案
试题解析
由题干可知两个逗号之间的部分是作为非限制性定语从句来修饰this custom的，因此应当选择关系代词which。句意：这个习俗起源于许多世纪以前，现在正在慢慢消失。
With an appropriate relative pronoun or relative adverb:
This custom,originated many centuries ago, is slowly disappearing.
由题干可知两个逗号之间的部分是作为非限制性定语从句来修饰this custom的，因此应当选择关系代词which。句意：这个习俗起源于许多世纪以前，现在正在慢慢消失。