You ____ finish your homework before you go to bed.
Đáp án đúng là: A. must
Giải thích:
Câu này kiểm tra về cách sử dụng động từ khuyết thiếu. 'Must' diễn tả sự bắt buộc, 'have to' cũng vậy nhưng thường do yếu tố bên ngoài, 'should' và 'ought to' diễn tả lời khuyên. Trong trường hợp này, 'must' phù hợp nhất vì nó thể hiện sự cần thiết phải hoàn thành bài tập về nhà.
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