I DID NOT SEE SUSAN OFF AT THE AIRPORT. I FEEL BAD ABOUT IT NOW.A....

49.I did not see Susan off at the airport. I feel bad about it now.A. I could have seen Susan off at the airport.B. If only I had seen Susan off at the airport.C. That I did not see Susan off at the airport escapes me now.D. It suddenly dawns on me that I should have seen Susan off at the airport.