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 考査動詞的時態(tài)和語態(tài)。根據句中的could have done 可知是對過去事情的推測，故用一般過去時。主語their flight與delay之間為被動關系，故用被動語態(tài)，句意：他們本可以參加頒獎典禮的，但他們的航班由于天氣不好被延遲了。故選A。