单项选择：The teaching building has five floors.My classroom is _____the third floor.A.on B.inC.at D.to
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单项选择：Theteachingbuildinghasfivefloors.Myclassroomis_____thethirdfloor.A.onB.inC.atD.to单项选择：Theteachi
单项选择：The teaching building has five floors.My classroom is _____the third floor.A.on B.inC.at D.to
单项选择：The teaching building has five floors.My classroom is _____the third floor.A.on B.in
C.at D.to
单项选择：The teaching building has five floors.My classroom is _____the third floor.A.on B.inC.at D.to
A
on the .floor（在……楼）固定搭配
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A
on