Question

Fill in the blanks with the most appropriate words.
I must apologize _____ you _____ not answering your letter at once.

• A. from / of
• B. at / for
• C. from / in
• D. to / for

Answer 1

The correct option is D to / for

A preposition is a word which comes before a noun or a pronoun and establishes a relationship between the elements of a clause or words.

The correct answer is option D) to/ for as 'to' answers the question to whom (you) and 'for' indicates a purpose( not answering your letter at once).

Option A, B, and C are not correct as the first blank cannot take 'from' (indicates a source) and 'at' ( indicates a location) and the second blank cannot take 'of' (indicates belongingness ) and 'in' (indicates a particular location which is within a larger area).

I must apologize to you for not answering your letter at once.