All the students are back ____ home.A.to B.at C./

All the students are back ____ home.A.to B.at C./ All the students are back ______ home. look,() students are happy at school A.the all B.all the C.t All the students are back at school.句中at能否换成to?为什么? ________are back at school.　　A.All the students　　　 B.All stu are all the students back at school?is there a new building? The students are working ____ a model plane.A.to B.in C.with (All the students )are back at school.对括号里提问. （ ）are back at I prefer ____ on the Internet at home.A.surf B.surfe C.to su I prefer ____ on the Internet at home.A.surf B.surfs C.to su The students ( ) doing sports. A.are all B.all are C.all can 选择题Welcome back 什么 A at hone B home C to home