问题
选择题
They could have attended the awarding ceremony，but their flight due to the bad weather．
A．was delayed
B．had been delayed
C．has delayed
D．was delaying
答案
答案：A
题目分析：考查时态和语态。根据句中的could have done可知是对过去事情的推测，故用一般过去时。主语their flight与delay之间为被动关系，故用被动语态。句意：他们本可以参加颁奖典礼的，但他们的航班由于坏天气延迟了。故A正确。