I'm really sorry,( )I can't go to your party.括号内应该填and还是but?

I'm really sorry,( )I can't go to your party.括号内应该填and还是but?
I'm really sorry,( )I can't go to your party.括号内应该填and还是but?

I'm really sorry,( )I can't go to your party.括号内应该填and还是but?
but
这种情况都是用but
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