1)介词后面的关系词不能省略。来源:考试大 2)that前不能有介词。 3) 某些在从句中充当时间,地点或原因状语的"介词 关系词"结构可以同关系副词when 和where 互换。 This is the house in which I lived two years ago.来源:考试大 This is the house where I lived two years ago. Do you remember the day on which you joined our club? Do you remember the day when you joined our club?