单选题
All flights ______ because of the snowstorm, we decided to take the train.
A、
were canceled
B、
had been canceled
C、
having canceled
D、
having been canceled
【正确答案】
D
【答案解析】
非谓语动词。具体说来，该题考查分词独立主格，同时由于该独立主格表示的动作发生在主句谓语前，所以使用分词独立主格的完成时形式。
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