[10] All flights _____ because of the snowstorm,we decided t

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[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
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?

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