IN THE MIDDLE OF OUR DINNER THERE WAS A KNOCK AT THE DOOR

10. - E 11 3 TONG BT TRAC NGHIEM HK1
E 11 3 TONG BT TRAC NGHIEM HK1
10. In the middle of our dinner there was a knock at the door. (when)a. met b. had met c. have met d. was meeting____________________________________________________