Question

We offered our congratulations ________ his passing the college entrance exams．

1. A.
   at
2. B.
   on
3. C.
   for
4. D.
   of

Answer 1

B
解析：
congratulate指對人祝賀，如表達“就某事祝賀”，一般用介詞on。congratulate sb．on sth．意為“為某事而祝賀某人”。