UNFORTUNATELY, I DIDN'T HAVE YOUR ADDRESS. IF I _______ IT, I WOUL...

15. - BAI KIEM TRA 45 SO 3 HK2TINH QUANG NINH HS YEU
BAI KIEM TRA 45 SO 3 HK2TINH QUANG NINH HS YEU

15. Unfortunately, I didn't have your address. If I _______ it, I would have sent you a postcard.

A. had had B. had have C. have had D. had