All flights () bacuse of the snowstorm ,many passengers could do _英语解答

All flights () bacuse of the snowstorm ,many passengers could do nothing but take the train .
A had been canceled B have been canceled Chaving been canceled Dbeing canceled .答案选第三个为什么啊,

人气：451 ℃　时间：2019-08-21 05:35:53

解答

前后句子主语不一致
所以要用独立主格结构：逻辑主语+加分词的形式
这里All flight 是逻辑主语
having been canceled 是分词
因为暴风雪已经发生,所以用完成时