题目内容:
All the flights ______ because of the snowstorm, we had to take the train instead.
Awere canceled
Bhad been canceled
Chaving canceled
Dhaving been canceled
答案解析:
All the flights ______ because of the snowstorm, we had to take the train instead.
Awere canceled
Bhad been canceled
Chaving canceled
Dhaving been canceled