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 该题为“逻辑主语+doing”构成的主语独立结构,表示原因。
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