There used to _____a bkkokcase in my room.为什么横线的地方要填be而不是填have

There used to _____a bkkokcase in my room.为什么横线的地方要填be而不是填have there _____a lot housework to do. Rural china today is not what it _____A.was used to B.used toC.was used to be D.used to be选哪个?为什么? 中学英语语法题,老师请进.1.There _____ many tigers in Changbai Mountains.A,used to be B,used to have 2.I hear that you went to London last month,No,_____A,I had never B,I have never3.I wasn't surperised to hear the news at all A,So was I B, 初中语法题求解.1.There _____ many tigers in Changbai Mountains.A, used to be B,used to have 2. I hear that you went to London last month,No, _____A,I had never B, I have never3. I wasn't surperised to hear the news at all !A,So wa there used to be的意思!RT, 请问 There used to be a park. ______ plenty of water in this river.A.There used to being B.there used to beC.There is used to beingD.There was used to be There ___ a museum here. A.used to B.used to do C.used to have D.used to having There used to be a clean river.为什么不是There used to have a clean river -------- a small book store in thistown.( they used to be ,it used to have ,there used to be ,there used to have) there are not good places to _____a stay b stay in c live d live in he used to _____a walk after supper,_____he?A.take/usen't B.have/did C.taking/usen't D.have/used not _____a class meeting this afternoon.A.There is going to have B.There is going to beC.There will have D.There are going to have 初中英语同义句转换we used not to like Peking opera.we ______ _______to like peking opera.the sick girl needs an operation.the sick girl needs to be ____ ___.She will start a shopping mall over there.She will ___ _____a shopping mall over the What's the chance of _____a general election this year?A.there being B.there to be C.there be D.there going to be 英语翻译There used to be a coffee shop next to your house,did't there?其中,used to There [ ]a river in front of our houseA used to have B was used to C used to be D was used to being