for the fact that he was working abroad, he would have helped with the project.

_________ for the fact that he was working abroad, he would have helped with the project.
A. Had it been
B. If it hadn’t been
C. If it had been
D. Hadn’t it been

Đáp án B

Đáp án B
Giải thích: If it hadn’t been for the fact that + mệnh đề: nếu không có sự thật là …
Dịch nghĩa: Nếu không có sự thật là anh ấy đang làm việc ở nước ngoài, anh ấy đã giúp dự án.