Mark the letter A, B, C, or D to indicate the underlined part that needs correction in each of the following questions.
Those who had already purchased tickets were instructed to go to gate first immediately.
A. Those
B. had already purchased
C. gate first
D. immediately
C
Không có “ gate first” => sửa thành “ first gate”- cổng đầu tiên
=>Đáp án C.