I wish I had seen you before. (Exclamatory)
How! I seen you before.
Had I seen you before!
Oh! I seen you before.
If I seen you before.
সঠিক উত্তর:
Had I seen you before!
ব্যাখ্যা ও নোট:
I wish + past perfect (had seen) দিয়ে unreal condition বোঝালে exclamatory করার সময় 'Had' বাক্যের শুরুতে চলে আসে।