I have no choice but to give up.这一句型里but to give up做什么成分?

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I have no choice but to give up.这一句型里but to give up做什么成分?
我知道它的意思想请教一下语法上的结构,没问翻译呀，but到底是介词还是连词

ut：prep.（介词）,后面的不定式是介词宾语,介词和介词宾语一起构成介词短语,在句中表选择,作状语
例句：He wanted nothing but to stay here for another day.他只是想在这再呆一天.
I have no choice but to tell you the truth.我只有告诉你实话.
There was nothing to do but (to) wait till help came.只有等待救援了.
* 如果谓语动词为实意动词do的某种形式时,but 后的不定式要省略符号to.如：
I can do nothing but let him know.我只能通知她.
They did nothing but complain.他们只是抱怨.

I have no choice but to give up.这一句型里but to give up做什么成分? i do have no choice but give up （改错) I have no ____(choose ) but to give up I have no chance but ____________ .A to give up B giving up I have no choice but to wait.but to wait 做什么成分, but的用法.I have no alternative but to give it up.but 后面为什么是不定式 I can give up the choice,but could not choose to forego是什么意思 I have no idea.But I will never give up. I should give up trying, but I must have the courage to give want to give up,but sometimes I don't want to give up谁知道这句话中 I have no choice but to stay here. 中but to stay here 是什么成分? have to give up!