1.All flights ___ because of the snowstorm,many passengers could do nothing but take the train.
A.had been canceled
B.have been canceled
C.were canceled
D.having been canceled
该选哪个呢,为什么.
人气：348 ℃ 时间：2019-08-20 02:00:44
解答
选D
前后句子主语不一致
所以要用独立主格结构 ：逻辑主语+加分词的形式
这里The flight 是逻辑主语
having been canceled 是分词
因为暴风雪已经发生,所以用完成时
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