It is such honour to take part in celebration so how could I make any mistakes?A. an；/B.

问题补充：

It is such honour to take part in celebration，so how could I make any mistakes?

A. an；/

B. the；the

C. an；the

D. /；the

答案：

A. an；/

B. the；the

(答案→)C. an；the

D. /；the

解析：考查冠词。句意：参加这个庆祝活动是多大的荣幸，我怎么能出任何差错呢？It is an honour to do sth中honour的意思是“荣幸，光荣”，为可数名词，故用不定冠词；根据语意可知，此处celebration为特指，故选C项。

答案C