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
1.All flights ___ because of the snowstorm,many passengers could do nothing but take the train.
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.
A.had been canceled
B.have been canceled
C.were canceled
D.having been canceled
该选哪个呢,为什么.
英语人气：897 ℃时间：2019-08-20 02:00:44
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