Allflights 國語站 題庫 2.28W 大中小設置文字大小 問題詳情: All flights ____ because of the snowstorm, many passengers could do nothing but take the train. A. had been canceled B. have been canceled C. having been canceled D. being canceled【回答】C知識點:非謂語動詞題型:選擇題 TAG標籤:Allflights #