18.5 介词+关系词
 
1)介词后面的关系词不能省略。
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.
  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?






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