WE ARRIVED AT AIRPORT. WE REALIZED OUR PASSPORTS WERE STILL AT HOME...

1. We arrived at airport. We realized our passports were still at home.

A. It was until we arrived at airport that we realize our passports were still at home.

B. We arrived at airport and realized our passports are still at home.

C. Not until had we arrived at airport, we realized our passports were still at home.

D. Not until we arrived at airport, did we realize our passports were still at home.