The boy__ on my left is our monitorA.seating B.seated C.sitting D.being sitting [ (B) why?]为什么不是The boy （who is） sitting on my left is our monitor 呢

The boy__ on my left is our monitorA.seating B.seated C.sitting D.being sitting [ (B) why?]为什么不是The boy （who is） sitting on my left is our monitor 呢 Look at the photo ,the boy__ them is my good friend.用on in berween to 选择填空并做语法说明 in my left 还是on my left? ()my father is my mother in the picture括号里填On the left还是On the left of in front on the left is my grandma怎么理解 my mum's parents are on the left (提问) My father is on the left and my mother is on the (r.)填什么 I've left my gloves on the bus的left是神马意思? on the left side on the left stand on the left on the left look,the boy__ (play)__(happy). on the corner of street和on the street corner 有什么区别同样：on the left of me和on my left的区别 I left my keys on the table in my office还可以怎么说把left换掉 The man on my left is my uncle.（对划线部分提问） -------------- the man 《on my left》 is my nucle对《》部分提问 最好今天完成 The girl sitting on my left is my sister.中sit为什么要用进行时