You _________ travel alone to the mountain. Always go in a group.
A. must
B. mustn't
C. do
D. don't
Đáp án B
Giải thích: mustn’t + Vinf = không được làm gì
Dịch: Bạn không được đi du lịch một mình lên núi. Luôn đi theo nhóm.
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