I cannot help but to do sthI cannot help but do sth哪个正确或者都正确?I cannot help but letting him go.正确否?

问题描述:

I cannot help but to do sth
I cannot help but do sth
哪个正确或者都正确?
I cannot help but letting him go.正确否?

I cannot help but do sth 这个对``因为不用to的原因是动词不定式符号``but是个因果词不是动词``顾选后者```

前者

两个都正确.