The underground in Nanjing has been in service(since September,2006)-------------对括号部分提问( )( )( )the underground in Nanjing has been in service?

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TheundergroundinNanjinghasbeeninservice(sinceSeptember,2006)-------------对括号部分提问()()()theunderground

The underground in Nanjing has been in service(since September,2006)-------------对括号部分提问( )( )( )the underground in Nanjing has been in service?
The underground in Nanjing has been in service(since September,2006)-------------对括号部分提问
( )( )( )the underground in Nanjing has been in service?

The underground in Nanjing has been in service(since September,2006)-------------对括号部分提问( )( )( )the underground in Nanjing has been in service?
how long has the underground in nanjing been in service?