◎ 题干
All flights___ because of the snowstorm, we decided to take the train.
A.were canceled B.had been canceledC.having canceledD.having been canceled
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“All flights___ because of the snowstorm, we decided to take the train. A.were canceledB.had been canceledC.having canceledD.having been canceled…”主要考查了你对  【现在分词的被动式】【现在分词】【不定式的被动式】【过去分词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。