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(since September,2006)----------------对括号部分提问

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(since September,2006)----------------对括号部分提问
( )( )( )the underground in Nanjing has been in service?
正确答案为:How long has the underground in Nanjing been in service?
或:Since when has the underground in Nanjing been in service?
或:Since what time has the underground in Nanjing been in service?
1.疑问句中,助动词has应该提前;
2.对since...提问,可以像对for...提问一样,都用How long作为疑问词,当然也可以用since when或since what time.