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We offered him our congratulations ___ his passing the college entrance exams.

        A. at       B. on      C. for        D. of

 We offered him our congratulations ____ his passing the college entrance exams.
  A. at   B. on   C. for   D. of

We offered him our congratulations ____ his passing the college entrance exams.

A.at               B.on                             C.for                                 D.of

We offered him our congratulations ____ his passing the college entrance exams.

A.at               B.on                             C.for                                 D.of

We offered him our congratulations ____ his passing the college entrance exams.

A.at               B.on                             C.for                                 D.of