单选题
2.
All flights ______ because of the snowstorm, many passengers could do nothing but stay at the airport.
A、
had been cancelled
B、
were cancelled
C、
having been cancelled
D、
have been cancelled
【正确答案】
A
【答案解析】
根据句意“由于暴风雪所有航班都取消了，许多旅客只能滞留在机场”，应使用被动语态、过去完成时。
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