请教两道非谓语动词对比题.

1.The stepmother had the little girl _________ housework.
2.---Will you do the job yourself?
   ---No,I have it ____
A. to do B done

C doing D do
答案分别为D B.为什么?

这两道题是考查have的句型
1、题是have sb do sth. “使、让、叫某人做某事”
2、题是have sth done “让别人做某事、找人做某事”或“遭受、蒙受某种损失”

If interested, you are warmly appreciated.

谢谢!