Tiếng Anh Lớp 12: Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions : _________ he could not say anything. A. However upset was he that B. So upset was that C. Therefore upset was he that D. So upset was he that, giúp em giải bài này ạ, em cảm ơn thầy cô và các bạn nhiều.