The visitors were complaining in the rain. about having to wait
80/80
Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions. The visitors were complaining in the rain.
for waiting
me about waiting
about having to wait
that they have to wait
Giải thích
Đáp án là C. complain to someone about (doing ) something: phàn nàn với ai về