had been done & having been done 区别

had been done & having been done 区别

题目
had been done & having been done 区别
All the flights____because of the snowstorm,we had to take the train instead.
A.were canceled B.had been canceled C.having canceled D.having been canceled
为什么不是B,不是应该用过去完成时吗?
答案
这是独立主格结构,不是谓语动词,所以不能用had been done,只能用现在分词完成时的被动式.如果你用had been done,we 的前面就必须加一个and 或其他的并列连词了.
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