[10] All flights _____ because of the snowstorm, we decided to take the train

.
A. were canceled
B. had been canceled
C. have canceled
D. having been canceled

翻译包括选项，详细分析句子。
答案D.

答案D
你的句子是独立主格结构句子。如果变成非独立主格结构句子就成了：As / Since all flights had been cancelledbecause of the snowstorm, we decided to take the train.这样的从句必须有连接词as / since. 如果没有，就成了独立主格结构。又如：
Tom has fallen ill,so I will do the work instead of him(有连接词so).变成独立主格就是：Tom having fallen ill, I will do the work instead of him.(没有连接词so) ok?

选having been canceled 是因为这个句子的前一部分是表示原因而不是简单的交代事件，因为有这个原因，才有后面的结果。 而且从语法角度讲，逗号没有连接两个句子的功能，如果选择前几个，第二个分句we 之前就需要加入连词如and, so

D

选D “因为暴风雪所有的航班被取消了，我们决定坐火车。”