John didn't understand what the story was about until he saw the film based on it.

50/50

He doesn't understand what the story is about.

Not until John saw the film based on the story did he understand what it was about.

It was until he saw the film based on it that John understood what the story was about.

John went to see the film before she read the story.

Giải thích

Kiến thức: Câu đảo ngữ

Giải thích:

Not until mệnh đề 1 + trợ động từ + mệnh đề 2: Cho đến khi …. thì mới …..

Tạm dịch:

John không hiểu câu chuyện nói về cái gì cho đến khi anh ấy xem bộ phim dựa trên nó.

Choose B.