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They could have attended the awarding ceremony，but their flight      due to the bad weather．

A．was delayed B．had been delayed
C．has delayedD．was delaying

A

解析試題分析：考查時態(tài)和語態(tài)。根據(jù)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(guān)系，故用被動語態(tài)。句意：他們本可以參加頒獎典禮的，但他們的航班由于壞天氣延遲了。故A正確。
考點：考查時態(tài)和語態(tài)

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