全国大众英语测验语法——介词+干系词
1）介词背面的干系词不能省略。
2）that前不能有介词。
3）某些在从句中充那时候，地点或缘故原因状语的"介词+干系词"构造可以同干系副词when和where交换。
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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