All flights ______ because of the storm,they decided to take

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All flights ______ because of the storm,they decided to take the train.
a.having cancelled b.were cancelled
c.have been cancelled d.having been cancelled

D
本句有主语,they decided to take the train 有主语、谓语,成分完整,所以前面只能用从句或者非谓语结构（分词或者动词不定式）,但是从句需要有关联词或者连接词引导,不过题目中没有关联词或者连接词,因此不能构成从句,只能考虑用分词或者动词不定式,这里有分词的选项,看A、D哪个正确
航班被取消,所以要用被动语态,所以D正确

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