All flights ____ because of the snowstorm, many passengers could do nothing but take the train....
Allflights____becauseofthesnowstorm,manypassengerscoulddonothingbuttakethetrain.A.had...
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
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