无线桥接可做到点到（）。
A.2点
B.3点
C.4点
D.4点以上都可以
参考答案：D
— He didn't go to bed last night until 12 o'clock last night.
— Yes. He ______ his experiment over and over, working till midnight. [ ]
A. played
B. showed
C. acted
D. performed
对全国范围内统一样式的发票由( )确定。
A．国务院财政部
B．各省、自治区、直辖市的财政局
C．国家税务总局
D．各省、自治区、直辖市的税务局
