Mary has been in China since three years ago.等于什么

Mary has been in China since three years ago.等于什么 Mary ____ ____in China since three years ago .填什么 Mr Green has been in Beijing since three years ago. Mary came to China three years ago.[改为同义句] Mary has [ ] in C He has been in Beijing since three years ago.(改为一般疑问句） He has been away from China( )three years ago We have been in China for three years ago .改错 Mary has been to New York since three weeks ago错在哪 Mr wang has been an english teacher since three years ago.对s I have been teaching in this school since three years ago.变同 She has lived in Shanghai( since three years ago).(就划线部分提问) .Mr Green_______ in China since five years ago.A.lived B.has