All flights______ because of the heavy storm, we decided to take the train.

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问题 All flights______ because of the heavy storm, we decided to take the train.

选项 A、having canceled
B、being canceled
C、having been canceled
D、canceled

答案C

解析 此处独立主格用作原因状语。因为flights是cancel的逻辑宾语,又置于cancel之前,因此cancel应用被动形式,而且航班的取消应发生在我们决定坐火车之前,所以用完成时态。因此C为正确选项。
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