Mark the letter A, B,...

Câu hỏi: Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions.

A. A waitress served us was very impolite and impatient. 

B. A waitress to serve us was very impolite and impatient. 

C. A waitress to be served us was very impolite and impatient. 

D. A waitress serving us was very impolite and impatient.