There is a blackboard_the wall and there are two doors_the wall.a.on,on b.in,in c.on,in d.in,on

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Thereisablackboard_thewallandtherearetwodoors_thewall.a.on,onb.in,inc.on,ind.in,onThereisablackboard

There is a blackboard_the wall and there are two doors_the wall.a.on,on b.in,in c.on,in d.in,on
There is a blackboard_the wall and there are two doors_the wall.
a.on,on b.in,in c.on,in d.in,on

There is a blackboard_the wall and there are two doors_the wall.a.on,on b.in,in c.on,in d.in,on
C 考查介词的用法,挂在墙上的东西用介词on,在墙上和墙构成一个整体的东西用in.例如：there are two holes in the wall.

in the wall 在墙上（凹进去）
on the wall 在墙上（在表面）
选C

on一般情况下表示在......之上；in表示在......里面。黑板挂在墙上，可以用on，门是开在墙里的，用in更好些。所以选C。供参考。

选C
on表示彼此有面的接触，黑板是在墙的表面上。
in指在墙里，门是在墙里的。

blackboard on the wall
doors in the wall

C.
黑板挂在墙上
门陷在墙里

1Here is some juice for( )(she)brother.2The man buhind （ )(he)is our friend.3Look at the blackboar.there are some squares on( )(it).4Can I stand beside （ )(they)5I have a brother.（ )is only one year old .I like( ).(his)6there are many toys.Let' Is there a window? There is a middle there is a cat there is a problem Is there a school Is there a house___? There is a Is there a. there is a There is a kitshen. There is a pair over is village a there there (.) There is a long r______ there. There( )(be)a football match,is there. there is a baby horse over there. there ,a there,is ,phone如何排列? where there is a life,there is a hope.