Question

Fill in the blank with the most appropriate word.
We have the pleasure ________ you that your book has been awarded the first prize.

• A. of informing
• B. in informing
• C. on informing
• D. informing

Answer 1

Answer: (A)

of informing

Here, 'of' as a preposition is correct as it is used to imply something belonging to something; being part of something; relating to something. Here, we have the pleasure 'relating to' informing that....'
'In' as a preposition is used to describe physical surroundings.
'On' as a preposition is used to imply in or into a position covering, touching or forming part of a surface.
'Informing' is grammatically incorrect because it does not have a preposition with it to complete the sentence.