What ________ you ________ at 9 a.m. this morning? A. did / do B. are / doing C. do / do D. were / doingĐoạn văn32/41TASK 2. Choose the best option to complete each sentence. Circle A, B, or C.What ________ you ________ at 9 a.m. this morning? did / do are / doing do / do were / doingGiải thíchĐáp án đúng là D