Tom has been in China for 3 years ,now he is very comfortable___(Speak)Chinese.求这道题的正解及原因

Tom got sick last May and has been in bed since then.为什么has been 而不是had been Tom has been in China for three years.(改为同义句)1.Tom has been in China ( ) three years( ).2.Three year ( ) ( ) ( ) Tom cane to China.3.Tom ( ) ( ) China three years ( ).4.It is ( ) ( ) ( ) Tom came to China. Tom has been in China for three years.(改为同义句)1.Tom has been in China ( ) three years( ).2.Three year ( ) ( ) ( ) Tom cane to China.3.Tom ( ) ( ) China three years ( ).4.It is ( ) ( ) ( ) Tom came to China. tom has been in the factory --- he left school.a.since b.as soon as Tom has been teaching in the vilage for ___（fair）a long time . among和between和in的用法Tom has always been popular_____his classmatesamong我知道对为什么不能是in Tom has been in China for 3 years ,now he is very comfortable___(Speak)Chinese.求这道题的正解及原因 (Tom's)brother has already been (to nearly every country in the world)对括号部分提问（一个括号一个 Tom (make)some progress in his lessons since last term. has been making 用动词的适当形式填空 It has been in my 用have/has been(to) ,have/ has gone(to),have/has been in 填空：1.--Where’s Jim?用have/has been(to) ,have/ has gone(to),have/has been in 填空：1.--Where’s Jim?---- He（）swimming2.Tom（）never（）the Great Wall3.They（）Beijing sin 英语Has been to 和Has been in 怎么用? has been to和has been in 的区别 has been in 和 has been to 的区别 Where is TOm?He _to England.He will be back in a mouth.(A.goes B.has gone C.has been D is going) Tom misses his father very much because his father _____ Japan for two years.A.has gone toB.has been in hello.this is tom.is jack in?sorry.he___for a month.A has been B go C is going D has gone.选词填空.加解析. all the students except tom has been abroad改错