He has been there for six months 和 My brother has never been abroad before.这2个句中为什么要加BEEN?FOR起什么作用呢》?

来源:学生作业帮助网 编辑:作业帮 时间:2024/08/12 18:40:18
xTMoQ+oՆ&.\&&5Pw.y-"Ra?mGJhh) ῴs +@F5qf{=w;0 h9H-Rȧx&#,\/E]Vq}Q6MI SO^ζԕ)'8gD`o3V,lꡐ*YUs'8.zv95*T,c[g<"xWS}<$ A8[5V[_Jfi ^}sQUvO(A1Lހcv'5*u}~W!$JD sT e;/Ӡ(+ayR F+ô#wPDS7/Ú\$(Fb t\dR] N60Jc~#t;|bfOFLjY2!D~ahTݏ]_P>\=wLO(t7:kŹ<ɥ\f~h$t