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指对人祝贺，如表达“就某事祝贺”，一般用介词on。congratulate sb．on sth．意为“为某事而祝贺某人”。