I`m sorry,( )I have to……括号里面填写连词,应该使用but还是and?

I`m sorry,( )I have to……
括号里面填写连词,
应该使用but还是and?

but
英语种习惯表达,委婉拒绝,或表示歉意,用but 接原因
例would you like to play football with me?
I'd like to ,but I have to do my homework

but,表转折

but ，转折关系，陈述自己的原因

but