has he
没有看到never1.I haven't seen him (for many years.){对括号部分提问}________ _______ ________ you____________ him?2.Mr.walker has been to Beijing (three times.){对括号部分提问}________ _______ ________ ________ Mr.walker been to Beijing?请解答，谢谢！！howlong have you seen him/how long havn't you seen himhom many times has Mr.walker been to beijing