I didn't pay attention to the teacher. I failed to understand the lesson.

49/50

Mark the letter A, B, C or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions.

Although I paid attention to the teacher, I failed to understand the lesson.

I would have understood the lesson if I had failed to pay attention to the teacher.

I would have understood the lesson if I had paid attention to the teacher.

Unless I failed to understand the lesson, I would pay attention to the teacher.

Giải thích

Đáp án C

Dịch: Tôi đã không để ý đến thầy cô. Tôi đã không hiểu bài gì hết.

(Áp dụng câu ĐK loại 3 để đưa ra giả định cho điều đã không xảy ra trong quá khứ).