Answer:
Since it is a causal conjunction, it is similar to 'since' or 'so that'. That is why it is used to introduce interrogative and exclamatory sentences.
Step-by-step explanation:
Porque es una conjunción causal, equivalente 'ya que' o 'para que'. Porqué es un sustantivo, sinónimo de 'causa' o 'motivo'. Por qué se emplea para introducir oraciones interrogativas y exclamativas.
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