Q: In this task, you are given a sentence. You must judge whether a single noun or verb has been replaced with another word with the same part of speech. The inversion would result in the sentence sounding unnatural, So unnatural sentences will be considered changed. Label the instances as "Original" or "Changed" based on your judgment.
After everything else had sealed off , the main hanger door shuddered once then began grinding open not metres away from where Beth and Dan now stood .
A:
Original