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
网友回答
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