这里是过去分词作定语,如果用被动语态的话,就是句子,那么就要用定语从句,而关系代词 which 不能省略.也就是原句=
this was a serious accident which was caused by inexperienced workers.
这里是过去分词作定语,如果用被动语态的话,就是句子,那么就要用定语从句,而关系代词 which 不能省略.也就是原句=
this was a serious accident which was caused by inexperienced workers.