MY MOTHER WAS PREPARING THE MEAL ……….A. I CLEANED THE FLOOR B. I AM...

39. - DE KIEM TRA 45 PHUT HK 2
DE KIEM TRA 45 PHUT HK 2
39.My mother was preparing the meal

……….

A. I cleaned the floor B. I am cleaning the floorC. when I am cleaning the floor D. while I was cleaning the floor