Question

22题答案给的it,如果填which或that 为什么不对？it指代谁？

The British psychoanalyst John Bowlby maintains thatseparation from the parents during the sensitive “attachment” period from birthto three may influence a child’s personality and lead to emotional problems inlater life. Some people have drawn the conclusion from Bowlby’s work that children should not be sent to day care before the age of threebecause of the parental separation (22) _________ involves, and many people dobelieve this. But there are also arguments against such a strongconclusion.

Answer 1

it是一个实实在在喊帆的实词，做involve的主语，不能省
可以说that it involves, which it invovles, that which可以省，it不行，不然雹渗御involve就没有主语了。
再多说一句，involves变成involved就可以略去it了，因为involve是动词，involved就是形容源岩词了，可以作后置的定语

追问

which 也可以做主语啊，这里it指代谁？为什么不能用that或which做主语

追答

which当疑问词讲的时候可以做主语，which is right？
这里明显不能啊
it指的是work的从句，（三岁前小孩子送去托管）这件事

追问

which在定语从句中可以做主语啊这里你说不能的原因是指代有歧义吗？it指代就没有歧义了？

追答

不是歧义，是需要一个it做主语
这样理解，it involves可以写成which it involves，which不是从句主语，it才是，which可以省，it不能