there is a clock __the wall__the bookcase中间应该填什么介词

there is a clock __the wall__the bookcase中间应该填什么介词

There is a clock on the wall behaind the bookcase.
在书橱后面的墙上有个钟.

on behind钟在书架后的墙上

There is a clock on<钟在墙的表面上所以用on 如果是窗户在墙上的话就要用in>behind/beside the bookcase.

There is a clock on<钟在墙的表面上所以用on 如果是窗户在墙上的话就要用in>behind/beside the bookcase.