高中英语单选（语法好的来吧）
1、A good friend of mine from________I was born showed up at my home right before I left for Beijing.
A.how B.whom C.when D.which
2、The house I grew up_____has been taken down and replaced by an office building.
A.in it B.in C.in that D.in which
这两句都是什么从句?