Question

10. 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

Answer 1

 10.   A 考査动词的时态和语态。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，但他们的航班由于天气不好被延迟了。故选A。