All flights______cancelled because of the snowstorm, many passengers could do nothing but take the train.

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问题 All flights______cancelled because of the snowstorm, many passengers could do nothing but take the train.

选项 A、had been
B、have been
C、were
D、having been

答案D

解析
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本试题收录于: 英语题库普高专升本分类
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