_____ on the stairs than the phone rang No sooner had I stepped16/64Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions. _____ on the stairs than the phone rang. No sooner had I stepped Had no sooner I stepped No sooner I had stepped Had I no sooner steppedGiải thíchĐáp án là A Đảo ngữ: No sooner+ had+ S+ PP than + S+V_ed: ngay khi… thì…