Do あなた think the glee/グリー club will ever know that Kurt can hit the high f?

I think that the club will eventually find out. (Unintentional eavesdropping?) But I don't think Kurt will flaunt that talent openly, he's too concerned about his dad.

No. I think that he will never let the club know because he is concerned about his dads feelings, and won't sing the girl part.

maybbeeeee because i know he doesnt want to because of his dad but it doesnt mean he will never sing it ever!

at some point