Tom's father is standing____ the dinning room

问题描述:

Tom's father is standing____ the dinning room
A.in the center of.B.in center
C.in the middle of.D.in the middle

C,center一般指外部建筑物的中心,如市中心等;middle指内部中间或是人群中;用of 表示所属关系.