MODULE 5 A Lesson in a Lab模块综合检测题组一—Do you know about Liu Guoliang?—Yes, he _______ an excellent pingpong player in the world, and now he is the chief coach of the national team.A. was used to be ?????B. used to be??? ??????????????? C. was used to being ????? D. was used for2. The Roman Empire _______ for several centuries.A. exists &nbs..