All Flights ______ BECAusE oF thE snowstorm, mAny pAssEngErs CoulD Do nothing But tAkE thE trAin.
A、hAD BEEn CAnCEllEDB、hAvE BEEn CAnCEllED
C、wErE CAnCEllED
D、hAving BEEn CAnCEllED