用how long 开头写问句,用been a cook ,30 years这两个提示回答,必须要用到时间段或时间语

How long have you been a cook?
I have been a cook for 30 years.用how long 开头写问句,用watchedtv,three o'clock这两个提示回答,必须要用到时间段或时间 语,how long 开头写问句,用beena cook ,30years这两个提示回答,必须要用到时间段或时间语,用how long 开头写问句,用readthebook, anhour ago这两个提示回答,必须要用到时间段或时间语