Câu hỏi: Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
Both of them____________ on the first TV program at the age of nine.
A. had appeared
B. have appeared
C. appeared
D. appear
Both of them____________ on the first TV program at the age of nine.
A. had appeared
B. have appeared
C. appeared
D. appear
Động từ appear trong câu phải ở dạng quá khứ đơn cho hợp với mốc thời gian at the age of nine.
Đáp án C.