All flights () bacuse of the snowstorm ,many passengers could do nothing but take the train .
题目
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,
答案
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
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