Once,this is a promise

Once,this is a promise This is a chance once in a blue moon, this is (a) house where once LuXun lived.为什么是a,这怎么会是泛指呢? this is the library - -(where.which) my brother goes to once a week.英语 this lively city----once a small fishing village---today is an international business center.怎么翻译 冠词,英语this is ( )house where we once lived.A .THE B .THIS C .THAT D.A理由 This is the house_____Luxun once lived in.A.thThis is the house_____Luxun once lived in.A.that B.whose C.where D./ 选哪个, This is the house.I once lived in it.This is the house--- ---I once lived Look this dog is still a------ .Let's send it to a hospital at once 填啥 This is the house ___ Mr.Green once lived.A.that B.which C.in which D.in that(解释) This is the house_______Lu Xun once lived.A where B which C that D in that为什么,谢谢 Is this factory__ your father once worked in before he retired.A.where B.which C.the one Dthat Is this school ___ you said Li Na once studied in your email ? A.that Bwhere Cthe one Din which This is the room where I once lived. This is 什么 the great man once lived This is the museum where I once visited改错 定语从句:1、This book is___I once read.2、This is the book___I once read.原因好么 1.Is this the factory_B___you once visited?A where B which C the one D in which 2.Is the factory _C__you once visited?A where B which C the one D in which 3.Is this the house_A__you once lived?以上三道的答案都为正确答案,但我总是弄