【单选题】When I entered the room, I saw him____ at the picture in front of the classroom. [ ]
【单选题】When I entered the room, the boy was in the TV series Journey to the West.
【简答题】When I entered the room, I found the cup (break) ________ on the table.
【单选题】He was cleaning his room when I entered the house. =His room _____ by him when I entered the room.
【单选题】下列原料乳中可作为乳品工业用原料的是()
【单选题】账务系统正式启用之后,下列功能中不允许使用的是( )。
【单选题】下列原料乳,可作为乳品工业用原料的是( )
【单选题】 下列化合物在 S N 1 反应中,哪一个卤代烃速度最快