请问：in which引导定语从句时，先行词是否必须为“地点/场所名词”？

请问：in which引导定语从句时，先行词是否必须为“地点/场所名词”？

回答如下:

介词in+关系代词which引导定语从句其先行词可以分为以下几类

(1)表示地点/场所的名词

This is the house in which he lived three years ago.

(2)表示时间的名词

1980 is the year in which he was born .

(3)表示某个事物的名词

Money is the animal in which he is most interested .

(4)表示某个抽象名词

History is the subject in which he is most interested