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
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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

All flights_because of the thick fog,we decided to go back to the hotel.why the answer is having been cancelled? all all all all all all all all All ALL that all all all in all all all 是什么意思? 含all的英语单词--all -all at all,in all ,above all, all the 英语翻译ALL