When / red light / on / you / stop./ A. When the red light on, you must stop. B. When the red light are on, you must stop. C. When the red light is on, you must to stop. Đoạn văn35/40When / red light / on / you / stop./When the red light on, you must stop. When the red light are on, you must stop.When the red light is on, you must to stop. When the red light is on, you must stop.Giải thíchChọn D