Those audiences ____ show their tickets before entering the concert hall.
Đáp án đúng là: A. have to
Giải thích:
'Have to' diễn tả sự bắt buộc do yếu tố bên ngoài (quy định). 'Must' diễn tả sự bắt buộc từ bên trong. 'Ought to' là lời khuyên. Trong trường hợp này, việc xuất trình vé là quy định, nên 'have to' là phù hợp.
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