All flights______because of the snowstorm, many passengers could do nothing but stay at the airport.

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问题 All flights______because of the snowstorm, many passengers could do nothing but stay at the airport.

选项 A、had been cancelled
B、were cancelled
C、having been cancelled
D、have been cancelled

答案A

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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