为什么空格处填 has been raised 而不是has risen 或 has raised?The tempreture is this room_____high enough to let these small children feel warm and comfortable.

为什么空格处填 has been raised 而不是has risen 或 has raised?The tempreture is this room_____high enough to let these small children feel warm and comfortable. 英语：为什么填has been Tom is one of the students who ( )to china.为什么空格中不能填has gone ,一定要has been.我知道两者的意思,觉得都可以填,但是找的答案都是后者,为什么呢?谢谢了. his health _____ a lot over the past decade.为什么空格用has been improving 而不是 has been improved susan has been to school camp before.为什么填has been to?为什么填has been to?不填has gone to? It （has been） suggested that bright children take their exams early为什么填has been ----Peter has been eating sweets all day.----No____he's not hungry.横线处填wonder,为什么不能填doubt呢? It ___ six years since I left school.空格填什么?It ___ six years since I left school.能填is,那has been 能不能填啊? 1.Mr.Li regarda Ningxia as his second ______ because he has been here for over twenty years.空格填的是family为什么不可以是home?2.It's________ train ride from here to that city.空格填的是8 hours'为什么不可以是a 8-hour?3.Good mo 求空格处填 the man would have been saved if a helicopter ___(be)available.空格处为什么填had been呢?主句不是过去完成时吗?那从句为什么也用过去完成时呢?为什么不再往后推一个时态呢?都快搞混了 Joe ____ go to the doctor.He has a fever.请问这个空格填 has to 还是 may?为什么? Has Jim arrived yet Yes ,he has ___there for several days .填been还是gone为什么 Jim___for thirty years.为什么填has been married?直接说has married不行吗?再说也应该是been +V行式啊. the work has been __ finished.为什么要填nearly?而不填almost?谢谢. All __ done now.为什么要填has 而不填have been和have? --- has she done with the tea ? 空格处 填what 还是how This parrot has a _______(大的)tail 空格处应该填什么