无线电频率使用期满，需要继续使用的，（）手续。
A.必须办理续用
B.只需办理登记
C.重新办理申请
D.只需办理备案
参考答案：A
The Chinese football team had experienced a series of reforms. However, its performances in Shenzhen in October all the people, especially the crazy fans.
A．knocked down
B．let down
C．pulled down
D．brought down
