where is my football,Mum?

问题描述:

where is my football,Mum?
Isn't it______the door?
A.in B.behing C.at the back of D.in the center of
为什么这样选

B.behind为什么这样选据意难道它不在门后面吗为什么不选at the back of?不也是在后面的意思?at the back of指在范围内的后面 如在房间的后面 at the back of the classroom