You _______ touch that switch.
A. mustn't
B. needn't
C. won't
D. wouldn't
mustn't: không được phép
needn't: không cần
won't: sẽ không
wouldn't: sẽ không (ở quá khứ)
=>You mustn't touch that switch.
Tạm dịch: Bạn không được phép chạm vào công - tắc kia.
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