Mark the letter A, B, C, or D on...

Câu hỏi: Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.
When I got to (A) the passport control, there was a long line (B) of people waited (C) show (D) their passport.

A. got to

B. a long line

C. waited

D. show