17. Jessica: Did you hear about the big factory fire last week?Benjamin: Yeah, it’s sad to see quite a few people die from the heavy smoke.Jessica: I’m wondering how often your workers are trained in fire drills, so they know what to do if there is a fire.Benjamin: Fire safety is a big deal. To get well prepared in case of a fire, __________ (A) we learn to play with fire. (B) we hold drills on a regular basis. (C) we switch off the smoke detector. (D) we set fire to some safety equipment.