---- Look! Everything here is under construction.

---- Oh, has the building once ___ for exhibition been pulled down, too?

A. having been built???? B. being built??? C. to be built??? D. built

---- Look! Everything here is under construction.

---- Oh, has the building once ___ for exhibition been pulled down, too?

--- Look! Everything here is under construction.

--- Oh, has the building once ___ for exhibition been pulled down, too?

1. A.
   having been built
2. B.
   being built
3. C.
   to be built
4. D.
   built

---Look! Everything here is under construction.
---Oh, has the building once ______ for exhibition been pulled down, too?

1. A.
   being built
2. B.
   been built
3. C.
   to be built
4. D.
   built

---- Look! Everything here is under construction.
---- Oh, has the building once ___ for exhibition been pulled down, too?