The visitors were complaining in the rain. about having to wait

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.
The visitors were complaining                          in the rain.

A. for waiting

B. me about waiting

C.about having to wait

D.that they have to wait

* Đáp án

* Hướng dẫn giải

Đáp án là C. complain to someone about (doing ) something: phàn nàn với ai về

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