It was not until the students were seated________ he had the wrong test booklets.Đoạn văn54/55X. From the words or phrases - a, b, c or d- choose the one that best completes the sentences.It was not until the students were seated________ he had the wrong test booklets.that the proctor realized when the proctor realized as soon as the proctor realized and the proctor realizedGiải thíchĐáp án đúng là a