-------John and I will celebrate our fortieth wedding anniversary next month.
--------Oh, !
A. cheer up
B. well done
C. go ahead
D. congratulations
网友回答
A. cheer up
B. well done
C. go ahead
(答案→)D. congratulations
解析：本题考查交际用语中单词（短语）的区别，根据题意可知：这儿应用一个表示祝贺的词（短语）。故选D。