1.A.可先改成一般疑问句形式：Who is the owner of this dictionary,因此用A.CD不符合think引导的疑问句式,what/who/which/where do you think.
2.C.你确定你没有打错字?应该是that is my duty.宾语从句.改为一般简单句为：to show deep conern for every student is my duty.
3.B.固定搭配.have something done,have somebody to do都表示让别人做的,而自己没有做.如have my heir cut.剪头发不可能自己剪吧!
Did you often have someone to wash your clothes?
Yes,I often have them washed.（这里的them是指上文中的clothes,翻译成：是的,我常常让别人帮我洗.）