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the fights ________because of the snowstrom,many passengers

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the fights ________because of the snowstrom,many passengers could do nothing but take the train.
A.had been canceled B.have been cancled C.were canceled D.having been caneled 为什么选D
the fights ________because of the snowstrom,many passengers
真正的主句是many passengers could do nothing but take the train.这是一个完整的句子.
中间用逗号隔开了,就表示the fights having been caneled because of the snowstrom不是一个句子,这里相当于一个状语从句.