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A-D (luggage ↔ registering): "Luggage" does not fit in the first part of the sentence; "registering a complaint" is the correct phrase. "Luggage" correctly fits in the last part of the sentence.B-C (month ↔ following): "Month up through phone calls" is incorrect; the correct phrase is "following up through phone calls." "For over a month" is the correct usage.Thus, swapping A-D & B-C makes the sentence grammatically and contextually correct.Despite registering ( D ) a complaint at Pune airport and following ( C ) up through phone calls for over a month ( B ), the elderly couple are yet to get their luggage ( A ).
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