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Answer:
3. to close
Step-by-step explanation:
→ The underlined word in the sentence "necesitas cerrar la puerta" means to close.
→ The Spanish verb cerrar can mean both "to close" and "to shut", but in this context, it is clear that the door is already open and needs to be closed.
→ The other options, "to open", "to hide", and "to see" do not make sense in this context.
→ So the correct option is 3) To close.