thisis a room in kate's house.there is a big bed,a table……

thisis a room in kate's house.there is a big bed,a table…… Kat worked in administration for many years Kat had worked in administration for many yearsKat has been working in administration for many years有人能指明他们意思上的区别在哪里吗?有点confusing.thanks a lot. what is this in english的答句为什么一般不用thisis回答那答句为什么要加a呢? His room is in a once in a blue room There is a desk in room.I often_______________in my room. kat-tun what room are there in a A ROOM IN THE WEST END怎么样 things in a living room一类 his room isi in a mass是什么 Mary o( ) a room in the flat Tony often makes a[ ] in his room ( )there a telephone in the room? Mary o( ) a room in the flat they inAre they in A.the Room-408B.Room 408C.408 Room选那? Which room shall we live in tonight?– In __________.A.the Room 406 B.Room 406C.the 406 Room D.406 Room选哪个?为什么? He lives in a room, 8 meters in _____(long)