Susan's mother works at a radio station .(改为一般疑问句)

Susan's mother works at a radio station .(改为一般疑问句) He works in a TV station (改为一般疑问句) my mother works in a hospital.改为一般疑问句 He works at a radio station.为什么 用at? He works at a radio station.对“at a radio station”提问 Michael works at a radio station 对 at a radio station 提问 at,his,works,station,brother,a,radio.连词成句, mr Biack works in the police station 改为一般疑问句 LiPing 's mother is a nurse 改为一般疑问句 Helen's mother is a nurse 改为一般疑问句 He works at a radio station,这里的“a”可以去掉么? 请问Lucy‘s mother works in a company（改一般疑问句）怎样改?