Student A: ______________ Student B: To protect our homes from criminals.182/300Mark the letter A, B, C or D on your answer sheet to indicate the sentence that best completes each of the following exchanges. Student A: ______________ Student B: To protect our homes from criminals.How do we use CCTV Security Systems?What do we use CCTV Security Systems for?What are CCTV Security Systems?Why do we use CCTV Security Systems for?Giải thíchChọn B