Pointing to the house on____ roof grew lots of bush,the old man told me that was______I would stay.

题目

Pointing to the house on____ roof grew lots of bush,the old man told me that was______I would stay.
A.its,what
B.whose,what
C.whose,where
D.its,where
我是想问,为什么第一个空不能是its,什么情况下,才能改成its

答案