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  3. All flights______because of the snowstorm, many passengers could do nothing but take the train.

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

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问题 All flights______because of the snowstorm, many passengers could do nothing but take the train.
选项 A、had been canceled
B、have been canceled
C、were canceled
D、having been canceled
答案D
解析
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