All flights ____________________(被取消了) because of the terrible weather, they had to go there by train.

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问题 All flights ____________________(被取消了) because of the terrible weather, they had to go there by train.

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答案having been canceled/called off

解析 首先,从句中是航班flights作主语,所以要用被动语态be cancelled/called off。其次,根据句中的意思可以推断出航班已经被取消,所以要用完成时态。同时,整个一段话只能有一个谓语动词,而且必须在主句中,所以此从句要用非谓语动词having been cancelled/called off。
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