有关英语语法it,that,which的问题,

题目

有关英语语法it,that,which的问题,
Mister Armstrong also helped write a funny book about life as a full-time television watcher.It is called the "Official Couch Potato Handbook." 这句话中 的it 可以用that
Couch potatoes enjoy watching television just as mouse potatoes enjoy working on computers.A computer mouse is the device that moves the pointer,or cursor,on a computer screen.这句话中的that可以用which替代吗?

答案

第一个 当然可以,都是代词哪有不能做主语的道理第二个 可以定语从句中只能使用关系词that不能使用which的情况主要有：1.当先行词是不定代词时,如:all ,few,little,much,every,something,anything,everything等2.当先...