Question

定语从句注：关系副词引导的从句可以由“介词+关系代词”引导的从句替换（when=in which、 where=in w

Answer 1

(1) The reason __for___ __which___he refused the invitation is not clear,

(2) From the year ___in___ __which___ he was going to school he began to know me.

(3) Great changes have taken place in the city __in___ ___which__ I was born.