-What is that newly-built building?.
-What is that newly-built building?
-______ the students have out-of-class activities,such as drawing and singing.
A.It is the building that
B.That's where
C.It is in which
D.The building that
请问是选A,it是判断,that引导定语从句吗?如果不是那选什么为什么?