which和in which用法的区别

题目

which和in which用法的区别
为什么这个句子：
he lost the manuscript during the war,in which case he had to rewrite the book.
要用in which,能用which吗?有什么区别?

答案

二者的词性不同.　　which是关系代词或关系形容词,作为代词用作主语或宾语,作为形容词用作定语；“介词短语+ which”属于副词性,只能用作状语.如：This is my house, (which) is small and old.  这是我的房子,...