There are two blackboards the wall and two doors _th

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There are two blackboards ____the wall and two doors _____the wall.
A.in,in
B.on,on
C.in ,on
D.on ,in

答案D
试题分析：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.
考点：in the wall和on the wall的区别
点评：注意区分相似短语的区别.比如in the wall和on the wall；in the tree和on the tree；in front of和in the front of等.

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