【判断题】Operator, I have been trying to make a call foover an hour, and I keep getting a busy signal
【简答题】Operator, I have () trying to make a call foover an hour, and I keep getting a busy signal
【单选题】消食化积,又兼活血化瘀之功效的药是( )
【单选题】I must have ______ for ten minutes before the telephone operator put me through.
【单选题】建筑设备自动化系统按网络结构分为( )两种
【判断题】绿茶加工过程中苷类化合物的水溶液具有苦味,水解成苷元和糖体后,苦味消失。
【单选题】I must have hung ______ for ten minutes before the telephone operator put me through.