题干
Mr.Smith, together with his two sons,_____Shanghai for about five months.
A：has left
B：has been away from
C：have left
D：have been away from
答案(点此获取答案解析）
B
Mr.Smith, together with his two sons,_____Shanghai for about five months.
A：has left
B：has been away from
C：have left
D：have been away from
。 
