题目

Facial recognition technology(人脸识别技术）is widely used today. For example, police use it to search for bad guys. It's also used to unlock phones or doors. Now, a similar technology, known as facial detection(探测), is entering a new field: the business of advertising(广告). Such systems are going through tests in a small number of stores. One facial detection system can judge a person's happiness or fear level. That helps businesses see how people feel as they lo at products or advertisements in the store. Another system can detect whether someone is wearing eyeglasses291. I have no bench to ________, so I have to stand there ___________ TV for a while.A．sit on… watchB．sit on …watchingC．sit… watchingD．sit… Watch