SCHOOL EDUCATION SYSTEMI. HÃY CHỌN MỘT CÂU TRẢ LỜI ĐÚNG NHẤT

32. - DE THI TUYEN TIENG ANH 12 NHE
DE THI TUYEN TIENG ANH 12 NHE

32. Dynamite ______ by Alfred Bernard Nobel.

A. had been invented B. invented C. was being invented D. was invented