All the flights ______ because of the snowstorm, we had to take the train instead.
A、
were canceled
B、
had been canceled
C、
having canceled
D、
having been canceled
【正确答案】
D
【答案解析】
逗号前后句子无连词连接，因此前半句应用独立主格结构作状语，故排除A、B。由于动作发生在过去，且flights与cancel存在被动关系，因此用完成式被动语态，答案为D。
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