Fill in the blanks with correct usages. I am sorry ________.Afor keeping you waiting.Bto keep you waitingCfor keep you waitingDfor keeping to wait.Answer: B. to keep you waiting Read Explanation: 'sorry' ക്ക് ശേഷം to + v1 ( first form of the verb ) ഉപയോഗിക്കുന്നു . Correct expression: I am sorry to keep you waiting.Read more in App