there used to be（?）flight from here to Guangzhou,but（?）flight was called off for some resson

there used to be的意思!RT, 请问 There used to be a park. there used to be 一般疑问句是used there to be there used to be 一般疑问句是：Did there use to be...（对吗）there used to be 的否定句是：There didn't use to be...（对吗） ______ 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 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) didn‘t be 与weren't有什么区别The foreigners （）there ,But they （）the food there at first A.used to live ,didn‘t be used to B.used to live ,weren't used to C.are used to living ,didn‘t use to D.used to living ,usedn't to There used to be a bookstore near here.（改为反义疑问句） There used to be a small inn in the village,____ _____(反义疑问句） There used to be a tall tree here,usedn't it?(哪里错了?） There used to be.的反义疑问句是怎么样的? there be加used to 的反义疑问句是什么 There used to be some cities wall.的反义疑问句 there used to be an old ciname here,()/()()?反义疑问句 There used to be a lot of pandas,_______ ______? 谁能告诉我 有没有there is used to be there used to be a lot of manatees是什么意思 there used to be a reastrant here 与there used to be here a reastrant哪个对