ক. had invited you to come in
খ. would invite you to come in
গ. would be inviting you to come in
ঘ. would have invited you to come in ✔
ব্যাখ্যা: Had I known' দিয়ে শুরু হওয়া বাক্যটি Third Conditional, তাই Main clause---এ 'would have + V3' (would have invited you to come in) বসবে।
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