All flights_because of the thick fog,we decided to go back to the hotel.why the answer is "having been cancelled"?

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All flights_because of the thick fog,we decided to go back to the hotel.why the answer is "having been cancelled"?
All flights_because of the thick fog,we decided to go back to the hotel.
why the answer is "having been cancelled"?

All flights_because of the thick fog,we decided to go back to the hotel.why the answer is "having been cancelled"?
完成时作状语表示已经取消,强调过去的动作对现在的影响