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I've tried what/that/what that/all what I can选择的原因

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I've tried what/that/what that/all what I can选择的原因
I've tried what/that/what that/all what I can选择的原因
应该是what.这句话应该是个省略,后面i can省略了try,即,i can try,因为can 后面肯定得带动词.what在主句i've tried sth里做宾语,同时引导一个名词性从句(在主句中起名词作用),在此从句中也做宾语.that引导名词性从句时只能是连接次,不能做成分,例如,the fact that he is black is unknown to his classmate.而这里i can try里必须有个宾语. what that 什么都不是,不用去想它.至于all what.all本身可以做名词,所以本可以用一个定语从句.all也可以做形容次,这样的话all what 在语法上讲就没什么问题了.可是有点多余,所以,就用what吧.