全球通套餐分为（）版、（）版、（）版
参考答案：全能；畅聊；市话
真热假寒的病机是（）
A.阴损及阳
B.阳损及阴
C.阳盛格阴
D.阴盛格阳
E.阳盛阴虚
The students _____ a history class when the visitors came in. [ ]
A. had
B. were having
C. will have
D. are having
