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问题: 英语问题!请回答!

The reason ___she is absent today is not known yet.
答案分别是in that,which,for which,for what
正确答案是for which
为什么要用这个啊,其他的选项为什么不可以啊?which前面为什么加介词for啊?有什么意义吗?

解答:

reason后的从句形式如下:1.reason why/that/for which+从句(句子结构完整).如:You have no reason why/that/for which you are late for class. 2. reason that/which+从句(此从句必须缺主语或宾语或表语之一),如:Is that the reason that/which you give me?