It was only because his wife helped him that he was able to finish his book.

A. Without his wife's help, he couldn't have finished his book.

B. If only he he had been able to finish his book.

C. But for his wife’s help, he couldn’t finish his book.

D. If it weren’t for his wife’s help, he couldn’t have finished his book.

Đáp án: A

Giải thích: Giả định ở quá khứ dùng câu điều kiện 3: If + S + had Vp2, S + would have Vp2/Without + N, S + would have Vp2

Dịch: Nếu không có sự giúp đỡ của vợ thì anh ấy đã không thể hoàn thành cuốn sách này.