Dien Bien Phu is the place ________ our army won a resounding victory in 1954.12/50Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions. Dien Bien Phu is the place ________ our army won a resounding victory in 1954.whichthatwhat\D. whereGiải thíchĐáp án D