The only reason the party was a success was that a famous film star attended. -> Had it not.... sao chuyển a thành the ạ

-> Had it not been for the famous film star’s attendance, the party wouldn’t have been a success.

(Câu điều kiện loại III)
Cấu trúc : Had + S + (not) + Vpp + …/Had it not been for + N/cụm N/ Ving, S + would have + Vpp.