Ôn thi Cấp tốc 789+ vào 10 môn Tiếng Anh (Đề 8)

It was so a difficult question that no one could answer it.

34/40

Write the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction.

It was so a difficult question that no one could answer it.

so

question

could

it