What must you NOT do? Open the door. Slam the door loudly. Keep the door locked. Put things in front of the door.
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Look at each sign or notice and choose the best answers A, B, C or D.
What must you NOT do?
Open the door.
Slam the door loudly.
Keep the door locked.
Put things in front of the door.
Giải thích
D là đáp án đúng