【单选题】At the airport, I could hear nothing except the roar of aircraft engines which all other sounds.
【单选题】All flight ____ because of the snowstorm, many passengers could do nothing but stay at the airport.
【单选题】All flights ____because of the snowstorm, many passengers could do nothing but stay at the airport.
A.
had been cancelled 过去完成时
【单选题】( )是第一部被翻译成欧洲语言的中国戏剧。