觉得你没有把a、b、c、d的选项也贴出来,没办法解释你为什么选错
至于你提的语法问题,是不是该问一下老师?你该是中学生吧?完成时态也分过去、现在和将来,当然非谓语动词的完成时态也是
关于一道非谓语的问题All flights_____because of the snowstorm,we could
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