There are two blackboards the wall and two doors the wall.
A. in, in
B. on, on
C. in , on
D. on , in
网友回答
A. in, in
B. on, on
C. in , on
(答案→)D. on , in
解析:此题重点考查“在墙上”的两种表达方式,in the wall和on the wall。前者表示镶嵌在墙的里面的事物;后者表示张贴或挂在墙上的东西。因blackboard是挂在墙上的故用on the wall,而doors是镶嵌在墙上的故用in the wall,故选D。